You used to have muscles.
You can use it to me.
Sometimes, "used to" means "often", sometimes use+to just means "use". How to diff those two situations?
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First, "You used to have muscles" means that whoever is being addressed had muscles previously, but no longer has them. This is also seen in :
You used to have a blue car. It's red now.
You can distinguish this from use + to, simply by the fact that in "used to", the verb "use" is in the past tense i.e. "used". Also, use + to usually has a noun in between use and to.
So, you would know that this sentences:
You can use it to cook with/ You used to cook.
The first one was use + to, and the second has "used to "
There is a case in which there would be difficulty in distinguishing "used to" from "use + to" :
The stick can be used to mix the paint.
In this case, the way to distinguish the two, is that "used to", unlike "use + to", has the "used" as the verb i.e. You used to be strong, it used to be better, etc. Where as "use + to" usually has the "to" as part of an infinitive (The stick can be used to mix the paint).