1-C. When will they have the graduation party?When will they have the graduation party?
いつ、彼らは、卒業パーティーを催しますか?
2-C. W: When should we have the graduation party?W: When should we have the graduation party?
W:いつ、私たちは、卒業パーティーを催すべきですか?
3. (1) For young people, money enclosed in the greeting card is appropriate gifts on their birthday, graduation and wedding.(1) For young people, money enclosed in the greeting card is appropriate gifts on their birthday, graduation and wedding.