In describing ourselves or others, use verb to be such as am, is and are..
let us see the differences of using them into sentences. Look carefully to the picture below:

so when you’re talking about yourself, you can say : I am beautiful
If you’re talking about other people(girl/boy) you can say: she/he is beautiful
if you’re talking about a group of people, you can say: they are beautiful
now let’s practice! Complete the sentences below:
