Czy to poprawne

Temat przeniesiony do archwium.
Witam mam pare pytanek.Czy to jest poprawne:

When she had started to talk in classroom fallen deep silence.


How to become good looking person.

If you eat less but frequently you will stay in shape.


Chodzilo o to ze zdaje relacje ze spotkania.
After the meeting I have started doing those exercises and it's really working.

I believe that soon i will be looking just like you.

Dziekuje za sprawdzenie poprawnosci. Ooglnie te zdania odnosza sie do wspomnienia ze spotkania. Opisuje to kolezance.
I BELIEVE that soon i will look like you?

When she had started to talk in calssroom fell deep silent?

After the meeting i Have started DO ~

NIe wiem, co na to inni?