Both is always used when talking about two things.

Both can be used with a noun or itself alone.

It always takes a plural verb.

• Both my sisters are doctors.

• Both Ali and Mehmet live in İstanbul.

• Both live in İstanbul.
• Both are sleeping on the bed.
• Both Sam and Tim were at home.
• Both my brothers are in Paris.

Both can be used in different places in a sentence.

• Both Mike and Jim have a car. Mike and Jim both have a car.
• My wife and I both have to work full time.

• The students have both done their homework. (after an auxilary verb)

• They are both in the canteen.

• They can both come here. (after a modal verb)

• You will both lose your jobs.

• The girls both learn English. (before a verb)
• We both want to go home.

of may be used with determiners (the, my, your, these, those) but of is optional:

• Both of my sisters are doctors. = Both my sisters are doctors.
• She has eaten both of my apples = She has eaten both my apples.
• Both of the books are in the bag. = Both the books are in the bag.
• Tom crashed both of the cars. = Tom crashed both the cars.
• Both of her parents are in Germany. = Both her parents are in Germany.
• Both of these two sentences are correct. = Both these two sentences are correct.

• Both of them were arrested = Both them They were both arrested.
• Both of us are late. = Both us We are both late.
• Were both of them killed? = Both them Were they both killed?
• I invite both of you. = I invite you both. both you

• She called both of us = She called us both. both us

• I will eat both of them. = I will eat them both. both them.