In this case, used to is an adjective form.

I am used to hitchhiking Because it includes a preposition,

the phrase takes an object, usually a noun form. When an adjective is inserted to the sentence, it changes its verb form into a noun. What is Collaborating is the gerund, a noun form of the verb collaborate,. Other use: What used:

In this sentence, all of the sentences seem correct. However, some students should check for correctness. Please refer to the sentence references. The alternative I am used to collaborate… is not. I think I have to compromise.

I used to collaborate would be perfect. However, what will they be right? In this case, used is a verb form that means

(takes a non-infinitive) used as an auxiliary to express habitual or accustomed actions, states, etc, taking place in the past but not continuing into the present, taking place in the past but not continuing into the present “I don’t drink these days, but I used to, I

used to fish here every day, I used to fish today every day Note that these sentences mean different things. I am accustomed to collaborating and maybe even I am inured to collaborating. The first means I am accustomed to collaborating and perhaps even I am inured to collaborating. The latter means In the past I have collaborated. How can I become used to the way someone

is getting used to something?

The to in BE used to meaning “BE accustomed to” or “familiar with” is an ordinary preposition, taking a nominal object: He

was a strong lad, used to hardships.
We are mostly used to hot summers around our area.
She was used to his constant complaining. We had been over it for months, He was still in love with her back.

A clause takes an -ing form when the object is a clause or an object of the clause itself. It’s subject is deleted if it is the same as that of be used to, as in the example; otherwise, the subject may be cast in either object case (which puts somewhat more focus on the subject as agent of the action) or possessive case (which puts somewhat more focus on the action itself, and gives the verb a ‘nounier’ quality).

He would raise objections. How is he used to it.
Why doesn’t he raise an objection at every chance?

BE used to is quite distinct from the sorta ma modal used to, expressing past habit (the present form is no longer used in this sense). In that idiom the to is an ‘infinitive marker’, followed by a verb in the infinitive; the subject is always the same as that of used used and is always

omitted Back in the 80s I used to collaborate with others quite often.

What is “God Bless You”?