demost

Demostration

this and these

that and those

people or things near us

to introduce people

this is cheap

these are my friends, John and Juan

to begin a conversation on phone

be careful!

we say this is John and this is Juan

NOT: ( THESE ARE JHON AND JUAN)

hello, this is david

things or people aren't near us

reply to sth that sb has said

what's that?

shall we go to the cinema? " yes, that's a good idea

we use with nouns

exercises:

https://learnenglish.britishcouncil.org/english-grammar-reference/demonstratives

https://www.grammar.cl/Games/This_That_These_Those.htm