Help with Japanese please?

Question:

Are these sentences correct?

Nanimo wo tabette wa ikemasen. - You must not eat anything

Nihongo wo ia nakerebanarimasen. - You must say in Japanese

Sensei wo kira nakerebanarimasen. - You must listen to the teacher

Sensei wo egitte wa ikemasen. - ( I forgot what this ine means so if you could help me)

Thank you!

Answer:

1. tabetewa i....

2. iwa-nakereba ....

3. sensei no hanashi o (or "iu-koto o") kika-nakereba ...
--> We don't say "sensei o kiku"

4. egitte...?? (l)ine...??