1-C. I hadn't seen Ken for ages, but I always wondered about him.I hadn't seen Ken for ages, but I always wondered about him.
私は、ケンに会っていなかった、何年もダヨ、でも、私は、いつも気にかけていた、彼についてダヨ。
2-C. If my parents hadn't let me study in Germany at that time, I wouldn't have found such a good job there.If my parents hadn't let me study in Germany at that time, I wouldn't have found such a good job there.
3-C. Hadn't we better stay at home?Hadn't we better stay at home?
私たちは、しない方がいいですか、留まることをダヨ、家にダヨ?
4-C. If I hadn't broken up with Hannah last month, I would have been going out with her for two years.If I hadn't broken up with Hannah last month, I would have been going out with her for two years.