you use it to type words 

you use it ONLY to take photos or to make a video

you use them to listen to music (only you will hear it)

this is a computer you can carry with you everywhere

you can use it to call somebody (you can take it with you everywhere)

you use it to click something on the screen of your computer

you use it to get a picture from your device on a piece of paper

when you have an online lesson, you see your teacher on the....

you use them when you want to listen to music with your friends or at the party

when you want your teacher TO SEE you at an online lesson, you use it