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?
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 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:
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" :
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).
"used to" does not mean "often". It only means that something "was" a certain way and no longer "is" that same way.
Please explain what a sentence like "* You can use it to me" is supposed to mean. This is not correct English.