It even sounds good. This sentence omits the subject it.

I am an English teacher.

She (the subject) said (the predicate) loudly.

Generally speaking:

The subject is a noun and the predicate is a verb.

The car stopped.

Here he comes.

He left

He is my friend.

My right arm hurts.

She lives happily.

The sun rises every morning.

time flies

They work hard.

I see