to
Verb phrase Subordinator
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To has no meaning. It is used to introduce verb phrases.
It's important for you to understand.
She told them to be quiet.
You want me to do it, but I don't have to.
To finish quickly, we must work fast.
To continue like this would be foolish.
I don't know how to get there.
He got the keys to open the door.
It's too small to see.
You are all to be here at 7:30 tomorrow morning. Do you understand?
He arrived only to find that everyone had gone home.