- Jill says she's not looking forward to Jack's party next weekend.
- I very much look forward to meeting you soon.
- They're looking forward to joining their children in Australia
look back on = think back to
put up with = tolerate
come down with = fall ill with
There are a number of instances where such verbs end with the preposition to, e.g.:
face up to = confront
get round to = do something after some delay
get down to = concentrate on
Note that in such instances to is not part of any infinitive phrase. It is an integral part of the verb. And whatever it is that we face up to or get round to is normally expressed as either a noun phrase or as a verb phrase with an -ing pattern:
- I must get round to cleaning my car next weekend.
- And I must get down to reading Jack's article which he sent me two weeks ago
- I must face up to the fact that I'm never going to be promoted in this organisation.
- I managed to finish reading Jack's article by staying up till midnight.
- He's talking about getting it published in National Geographic magazine.
- Instead of going on holiday last summer, he undertook this arduous trip up the Amazon.
There is a complication in your example, Jolie, where both the -ing form and the to-inifnitive pattern appear possible:
- I cannot agree to share / to sharing an office with Ben.
- In no way can I agree to sharing / to share an office with Ben
- What have you agreed?
We've agreed to tidy our rooms when we get up, to clear the dishes from the table after eating and not to go out until we've finished our homework.
- What have you agreed to?
We've agreed to arriving punctually before the working day begins and to not leaving before five o' clock in the afternoon.
- What do you object to in her behaviour?
I object to her going out every evening and not telling me where she is going.