Welcome to the forums.
The rules about homework are:
1. We will not DO homework for you. Please don't ask.
2. We WILL answer general questions (including about phonology).
(3. Sometimes we might answer a very specific question about a homework assignment, especially if it is beyond what is required ["why was this not also an acceptable answer?" etc] or if it is about background information. But please don't overuse that, in the specific context of homework.)