Az alábbiak közül melyik mondatok helyesek nyelvtanilag? És ha valaki tud még segiteni a többiben irna privatban?

-If i were you, i would study for the exam.

-The teacher asked me don't leave the classrom.

-Has your sister gone to London?

-I did it by myself.

-I'm very good at English, am i not?

-If the weather is good, we might go for a walk.

-I will phone you as soon as I will receive the exam results.

-I promise doing my homework tomorrow.

-The match wasn't as interesting as I expected.

-There are some book on the table.