- To express purpose: he took the pen to sign the file
- After adjectives: It's good to see you
- After nouns: he has work to do
- After "the first", "the second", "the last", "enought", "too", "so...as": He was the first to arrive
- After "used to": He used to play tennis
- Common verbs that can be followed by infinitive: afford, begin, decide, choose, hope, learn, want, etc: they want to go to the circus
BARE INFINITIVE
- After perception verbs (hear, feel, watch, see...) with an object: I heard him lock the door
- After "Let "and "Make": The teacher make me repeat the exam
- After modal verbs: they can go there with their parents
-ING FORM
- Not only as a verbs but also like adjectives or nouns: running water (adjective); Smoking is bad your health (noun)
- After prepositions: She is good at skiing
- After "can't stand / can't bear ": I can't bear looking at her
- After expresions "be used to / get used to / look forward to / take to": My father was used to getting up at 5 am
- After certain verbs: like, hate, mind, remember, love suggest...: She likes playing the harmonica
-ING FORM OR TO-INFINITIVE
- Some verbs can be followed by to-infinitive o -ing form without different meaning such as, begin / continue/ hate / love / like / prefer / stay: He likes reading / he likes to read
- Another verbs can use both estructures:
- Remember + to = "acordarse de algo": please, remember to go to the bank
- Remember + -ing = "recordar haber hecho algo": she remember going to the bank
- Stop + to = "pararse para hacer algo":I stopped to post the letter
- Stop + -ing = "dejar de hacer algo": I can't stop loving you
- Forget + to = "olvidarse de hacer algo": they forgot to do the exercises
- Forget + -ing = "olvidar hacer algo": I'll never forget living in London
- Try + to = "intentar hacer algo": I tried to phone but the lines were busy
- Try +-ing = "probar a hacer algo /experimentar": I have a terrible headache!- Have you tried taking an aspirin?
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