Day 10

Today is wednesday and it is my tenth day on italki.com. I am a historian. Who is likes history?

'likes' in the last sentence is the main verb, and the sentence doesn't need any 'verb to be: is, am, are...'

Whereas simple sentences that contain adjectives or nouns need a verb to be. Examples:

She is pretty. (adjective)

They are students of history. (noun)

We also use them with present continuous verbs. Examples:

I am studying English.

He is writing a note on italki.