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Another questions from klovi
So, recently I've been working on Gerunds and Infinitives, and I found few expressions where I would use prepositions but my answer key says differently
1.) have problems: a) with doing something or b) - doing something
2.) waste time: a) on doing something or b) - doing something
3.) admit: a) to do something or b) to / on doing something c) - doing something
Which are correct?
In 1) and 2) using and omitting the prepositions are both correct. Personally I prefer to omit them.
As to 3), in my opinion both "admit to do something" and "admit on doing something`are incorrect.