Question

Correct mistakes: 1. They will coming on time. 2. We will left school.

Answer 1

1. They will come on time.
2. We will leave school

Answer 2

They will come on time
We will leave school 
Инфинитивы здесь нужно использовать после will

Answer 3

Corrected sentences:

1. They will come on time.
2. We will leave school.