Correct the mistakes in the sentence 1.she didn't late to the classes yesterday. 2.will you can help me to finish this work. 3.there are much mistakes in my test-work , aren't they? 4. i remembered that i left my keys at the office.

1.She WASN'T late FOR the classes yesterday.
2.Will you help me to finish this work? Или Can you help me to finish this work?
3.There are A LOT OF mistakes in my test-work , aren't THERE?
4. I remembered that I HAD left my keys at the office.