Here are the answers to your questions:
Question 1:
Which mood is used in his friend's sentence?
Answer: interrogative
Question 2:
Which explains verb mood?
Answer: It is how a verb is used to ask a question. (Note: This is only partially correct; verb mood also includes making commands and stating facts.)
Question 3:
Which sentence uses verbs in the conditional mood?
Answer: If it keeps snowing, we can go skiing.
Question 4:
Which sentence uses the indicative form of the verb play?
Answer: I am playing video games.
Question 5:
Which sentence uses verbs in the subjunctive mood?
Answer: I suggested that he read that new blog post.
Question 6:
Which sentence corrects the shift in mood?
Answer: They might go to the movies, or they could rent one at home.
Question 7:
Which sentence uses the conditional form of the verb send?
Answer: I could send a letter to our grandparents.
Question 8:
Which mood is used in the sentence?
Answer: subjunctive
Question 9:
Which of the following sentences is NOT written in the conditional mood?
Answer: Everyone appreciated my performance.
Question 10:
What two verb moods are present in the sentence above?
Answer: Indicative and Subjunctive
Let me know if you need further assistance!