grammatical or not

[fantastic]

HI
I have just became a member.

I have some sentences that are confusing me on how they are formed.

1-I have always learned that after the preposition (to) comes the infintive
(to+invinitve) for example (to+take).
.so, when can i use (to+verb+ing) such as I am looking forward to seeing you.

I will be so grateful if someone answeres this question.

[engee30]

Originally Posted by fantastic

HI
I have just became a member.

I have some sentences that are confusing me on how they are formed.

1-I have always learned that after the preposition (to) comes the infintive
(to+invinitve) for example (to+take).
.so, when can i use (to+verb+ing) such as I am looking forward to seeing you.

I will be so grateful if someone answeres this question.

You can use the gerund after to when it is used as the preposition in a prepositional phrase:

look forward to doing (to is not the infinitive here)
I am looking forward to seeing you.

come to doing (to is not the infinitive here either)
Whenever it comes to answering a question in class, Simon gets nervous and starts to stammer.

Check it with a dictionary if in doubt.

[fantastic]

thanks