you're the best guitarist in the school
no one ...in the school plays guitar better than you.
he didn't remember anything about it and i didn't either
he forgot ....anything about it, and i did, either
 school uniforms don't have to be worn at all times
students...don't have to wear school uniforms.
don't fry food which can be grilled
avoid......frying food which can be grilled.

with luck she will win the cookery competition
if...she is lucky, she will win the cookery competition.

No one in the school plays the guitar better than you.

He forgot everything about it, so did I.

Students don't have to wear school uniforms at all times.

Avoid frying food which can be grilled.

If she is lucky, she will win the cookery competition.