Gerund vs Infinitive: When to Use -ing and When to Use "to"

"I enjoy to swim." "I'm interested in learn English." "Before to leave, I locked the door." If you've ever written something like that and felt it was almost right but not quite, you've met one of the quietest troublemakers in English grammar: the choice between the -ing form and "to." German and Spanish don't force this choice the same way, so the mistake is completely natural. The good news is that most of it comes down to a handful of patterns you can actually feel, not memorize. Let's sort out gerunds and infinitives for good.

First, the two forms in plain language

A gerund is a verb with -ing on the end, used like a noun: swimming, reading, cooking, learning. A infinitive is the base verb with to in front: to swim, to read, to cook, to learn. Both can follow another verb, and that's where the trouble starts, because English is picky about which one goes where.

Same idea, two different builds. "Enjoy" demands the -ing form, "want" demands "to." Neither one is more correct than the other. They just keep different company. Think of it like dinner guests who insist on a specific seat.

Why German and Spanish speakers get caught

This isn't carelessness, it's your first language quietly steering the wheel. In German and Spanish, the infinitive does a lot of the work that English hands to the -ing form, so your instinct is to reach for "to" far too often.

German loves zu plus the infinitive: Ich habe Lust zu schwimmen, Es macht Spaß zu reisen. So "I enjoy to swim" feels perfectly logical. Spanish is even more consistent, it puts the plain infinitive after prepositions every time: antes de salir (before leaving), después de comer (after eating), estoy cansado de esperar (I'm tired of waiting). Copy that straight into English and you get "before to leave" or "tired of to wait." Both sound off to a native ear, and both are so common that I can usually guess a student's first language from which version they produce.

I learned this from the other side. When I moved to Peru on my own at 16 and started picking up Spanish through daily life with my host family in Cusco, English kept dragging me the wrong way. I'd build a sentence in my head in English and translate the structure word for word, and it came out wrong. The fix was the same one I'll give you here: stop translating the shape of the sentence, and learn the English patterns as whole chunks.

Pattern 1: verbs that always take -ing

One big group of verbs is always followed by the gerund. No "to" allowed. These are the ones that produce "I enjoy to swim," so they're worth drilling.

A quick feel for this group: many of them are about continuing, stopping, or reacting to an activity you already picture happening. "Keep talking," "avoid driving at night," "I miss living by the sea." How to fix it: don't memorize a bare list. Learn each verb with a little example attached, so your memory stores "enjoy reading" as one unit. When the verb comes out of your mouth, the -ing follows on autopilot.

Pattern 2: verbs that always take "to"

Another group always takes the infinitive with "to." Many of these point to the future, a plan, a wish, a decision, something not done yet.

Notice the forward-looking feel: when you want, plan, or decide, you're aiming at something ahead of you, and English marks that with "to." It's not a perfect rule, but it's a helpful instinct while the patterns settle in.

Pattern 3: after a preposition, always -ing

If you only remember one rule from this whole article, make it this one, because it fixes more German and Spanish mistakes than anything else. Any verb that comes straight after a preposition takes the -ing form. Prepositions are little words like in, on, at, of, for, about, before, after, without, by.

This is the big one because your own language does the opposite. Spanish uses the infinitive after every preposition, and German does something similar, so your brain fights you here. The trick is to treat the preposition as a trigger: the second you hear yourself say "in," "of," "about," or "before," the next verb gets -ing. Say a few out loud and feel it: "Thanks for coming." "I'm thinking about moving." "She left without saying goodbye." Once this becomes a reflex, a whole category of errors just stops.

Watch out for the sneaky "to" that is actually a preposition, not an infinitive marker. In look forward to, be used to, and object to, that "to" is a preposition, so it takes -ing: "I look forward to meeting you," not "to meet you." This one catches even advanced learners, and it shows up in emails all the time.

Pattern 4: as the subject of a sentence, use -ing

When an action is the subject at the start of a sentence, English strongly prefers the gerund.

Both versions exist, but in normal spoken English the -ing form is what people actually say. "Smoking is bad for you," not "To smoke is bad for you." If you start a sentence with an activity, reach for -ing and you'll sound natural every time.

Pattern 5: verbs that take both, with no real change

Here's where you can relax a little. Some common verbs accept either form, and the meaning stays basically the same. These are mostly verbs about liking and starting.

There's a gentle tendency: the -ing form leans toward enjoying the activity in general ("I love swimming"), while "to" can lean toward a choice or habit ("I like to swim before work, it wakes me up"). Honestly, don't lose sleep over that nuance. With this group, either form is safe, and nobody will blink.

Pattern 6: the tricky verbs that DO change meaning

Now the detail that makes you sound sharp, because even strong learners miss it. A small set of verbs changes meaning completely depending on whether you use -ing or "to." This is where a wrong choice doesn't just sound off, it says something you didn't mean.

stop + -ing means to quit the activity. stop + to means to pause in order to do something else.

remember and forget + "to" point to a task you must do. With -ing they point back to a memory of something already done.

try + "to" means make an effort at something difficult. try + -ing means experiment with something as a possible solution.

How to fix it: you don't need to drill the whole language this way, just these few verbs. Learn the pairs as little stories: "stopped smoking = quit," "stopped to smoke = took a break." Four or five pairs and you've covered the ones that actually come up in real conversation.

A few friendly extras worth knowing

After go we use -ing for activities, especially sports and leisure: go swimming, go shopping, go hiking, go running. Not "go to swim." And after the modal-style helpers can, must, should, will, would and after let and make (in "make someone do"), we use the bare verb with no "to" at all: "I can swim," "Let me help," "She made me laugh." Those aren't gerund-or-infinitive choices, but they trip people up in the same breath, so they're worth a mention.

If prepositions are a weak spot for you in general, they feed straight into this topic, so my guide to in, on and at pairs nicely with this one. And because so many of these verb patterns show up inside phrasal verbs, you might like my piece on phrasal verbs for everyday conversation too.

How to make this automatic

Reading the rules is the easy part. Getting the right form out when you're mid-sentence, heart rate up, someone waiting for your answer, that's the real skill, and it comes from use, not from re-reading a table. Here's what actually works, from years of watching students get there.

First, learn verbs in chunks, never as bare words. Store "enjoy reading," "want to go," "interested in learning," "look forward to meeting" as single pieces. Your brain recalls the pattern along with the word, so the correct form just arrives. Second, lean hard on Pattern 3. If you drill only one thing, drill "after a preposition, use -ing," because it fixes the most mistakes for German and Spanish speakers and it's a clean, reliable rule. Third, practise out loud, not silently. Say five -ing sentences and five "to" sentences every morning while the coffee brews. It feels a bit silly for two days, then it sticks. And fourth, the big one: get real speaking practice with someone who corrects you gently in the moment and then lets you carry on talking. When a tutor catches "I'm thinking about to move" the second it slips out, the fix lands far deeper than any worksheet. That's exactly how I learned Spanish in Cusco, through real conversations, small corrections, no shame, and a lot of repetition.

If you want to clean up a whole family of these patterns at once, my guide to the most common English mistakes German speakers make covers several related traps.

So, gerund or infinitive? Learn the two "always" groups, treat every preposition as an -ing trigger, use -ing when an action is the subject, relax with the like-and-start verbs, and watch the handful that flip meaning. Do that and the choice stops being a guess. It becomes something you feel, which is exactly what fluent English is supposed to be.