Does is the present tense third person singular form of do.
Use does when he/she or it are the subjects of the sentence.
He does Tai Chi, She does mathematics, It does not matter.
Or when there is a singular noun (one) subject.
My brother does Tai Chi. His sister does mathematics. The cat does wee on the carpet.
Does can also be used in yes/no question for the same subjects
Does your brother do Tai Chi. Does his sister do mathematics. Does it matter
Notice in the questions do is used not - Does your brother does Tai Chi.
THERE SHOULD BE QUESTION MARKS AT THE END OF THE QUESTIONS BUT WIKI ANSWERS WON'T LET ME SAVE ANSWERS THAT HAVE QUESTIONS IN THEM SO I HAVE LEFT THEM OUT
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