history of the english language?

I am totally going to fail my History of the English language test on Wednesday. I don't even understand the questions from past exams the professor gave us.

Discuss what the following language facts illustrate about the English language.

Current English spellings th, sh, ch, and dg.

Develop as fully as time permits the following accurage statements.

The current English verb form were shows traces of Proto Indo-European phonology and morphology.

Eep?