N.B. would like means 'wish' or 'want', and is always followed by the infinitive.
What would you like to do tomorrow? (Not: *What would you like doing tomorrow?)
4 Allow, advise, forbid and permit are followed by an-ing form when there is no personal object. If we say who is allowed, advised, etc, the infinitive is used.
Cf. Sorry, we don't allow smoking in the lecture room. - We don't allow people to smoke in here.
I wouldn't advise taking the car - there's nowhere to park. - I wouldn't advise you to take the car.
5 After see, watch and hear, an -ing form suggests that we observe part of a complete action; when we start looking or listening it is already going on. The infinitive is used when we want to suggest that we observe the whole action from beginning to end.
When I walked past his house I, heard him practising the violin. I heard Oistrakh play the Beethoven violin concerto last week.
When I glanced out of the window I saw Mary crossing the road. I watched him step off the pavement, cross the road, and disappear into the post-office.
6 Try + infinitive = it is your goal; it is what you want to do (to do something difficult.)
Please try to understand. I once tried to learn Japanese.
Try +-ing = it is the method you use to achieve that goal (you makean experiment; do something to see what will happen).
I tried sending her flowers but it didn't have any effect. Try putting in some more vinegar - that might make it taste a bit better .
7 Afraid of + -ing and afraid + infinitive can often both be used with little difference of meaning.
I'm afraid to fly/of flying. I'm afraid to tell/of telling her.
However, when we are talking about things which happen to us unexpectedly, without our wanting or choosing them, only the -ing form is possible.
I'm afraid of crashing. (Not: * ... to crash.) I don't like to speak French because I'm afraid of making mistakes. (Not: * ... to make ... ) ,
Compare:
I'm afraid of diving/to dive into the swimming-pool. (I don't want to do it). I'm afraid of falling into the swimming-pool. (=I don't want it to happen to me.)
( Here, * ... to fall is impossible.)
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