If there are two verbs together in a sentence, often the second one is either in the infinitive form (to play) or the continuous form (playing). Have a look at this example, only one of the sentences is correct:
· I enjoy to play piano X
I enjoy playing piano √
a. We use the infinitive after certain verbs:
- forget, help, learn, teach, train
-choose, expect, hope, need, offer, want, would like
-agree, encourage, pretend, promise, recommend
-allow, can/can't afford, decide, manage, mean, refuse
Have a look at these examples:
- You forgot to water the plants.
- I can’t decide what to wear.
- We promise to help you if we can.
- I hope to see you again soon.
- happy, sad, sorry, disappointed, angry, pleased, delighted, glad, surprised, relieved etc.
Have a look at these examples:
- I was sorry to hear about your recent troubles.
- I’m happy to hear from you.
- She was angry to discover Charles was lying to her.
- We’re delighted to have you here in our home.
- They were relieved to know it was all over.
- too cold, too hot, too windy, too sunny, too salty, too sweet etc.
Have a look at these examples:
- This tea is too hot to drink.
- It’s too windy to go for a swim today.
- This soup is too salty to eat.
- My feet are too sore to walk anymore.
- rich enough, clever enough, strong enough, tall enough, short enough etc.
Have a look at these examples:
- Are you tall enough to touch the ceiling?
- My four year old son is clever enough to read short novels.
- Will this glue by strong enough to fix the window?
- This sandwich is big enough to have for dinner!
a. The -ing form is used when the word is the subject of the sentence or clause.
Have a look at these examples:
- Running is an excellent form of exercise.
- Doctors say that eating too much butter is bad for your health.
- It is well known that smoking damages your lungs.
- avoid, dislike, enjoy, finish, give up, mind/not mind, practice etc.
Have a look at these examples:
- I dislike eating fish.
- I practice playing piano every evening.
- I enjoy baking cakes.
- I don’t mind working late, as long as I get paid overtime.
- to, without, against, at, by, from, for, until, with, up, before, after etc.
Have a look at these examples:
- We’re looking forward to meeting you.
- Don’t you leave the table withoutfinishing your dinner!
- I’m against wearing fur.
- I’m at the café waiting for you.
Sometimes you can use -ing or infinitive verbs without a change in meaning:
For example:
-It started to rain./ It started raining.
-I like to play sports./ I like playing sports.
-I hate to watch horse racing/I hate watching horse racing.
http://www.emagister.com/curso-grammar-business-english-gramatica-ingles/verbs-ing-vs-verbs-infinitive-verbos-ing-vs-verbos-infinitivo-ingles
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