I'd like to know whether verbs that come after one preposition, such as the ones below, must be in the -ING form.
- I'm interested In doing this
- His life depends On working
- He is good At learning languagues
- What is the advantage Of having a car?
- Why don't we go out instead Of sitting on here?
All verbs that came after one preposition "Of, In, At.." are written in the -ING form, is this a rule for every verb that comes after one preposition just like the examples above?
Many people didn't get my question, so I rewrote it.
I'm actually almost sure that they can only be written in the -ING form if one preposition is placed before them, because I have never seen: I'm interested in do this or He is focused on do his homework. However, I'd like to know whether or not there is one specified rule for this.