"I" is the correct word to use sometimes and "me" is the correct word to use sometimes.
Use "I" when you are referring to yourself and you are the subject of the sentence. For example, "I went to the store."
Use "me" when you are referring to yourself and you are the object of the sentence or in a prepositional phrase and the like. For example, "Grandfather gave me a gift."
Yeah, that is fine.
You should use "are".
You should use did.
you should use meters
You should use your treadmill on a regular basis. You should use it every day if possible. You should use the treadmill for twenty to thirty minutes.
you should use you all
Why should you improve your ability to use the library?
There are number of different kinds of gas you should use. The gas you should use depends on the situation.
You should not. You should use centimetres.
we should use had if the sentence is in past tence
if we made mistake
you should use spagetti and sauce