11, Only when I received his letter did I know that he was still alive.
12, Only after you have learnt English for years, can you master most of the basic grammar.
13, Not only did they robbed him, but they also smashed everything.
14, No longer my parents work on Saturdays and Sundays.
15, No longer does my brother learn E in an evening class.
16, Hardly had I started speaking when he interrupted me.
17, No sooner had she begun her performance than the light went out.
18, Not only does he spend all the money but he also borrowed from his friends.
19, Not until did I get home I didn't know that I had lost my key.
20, On no account should he leave the hotel.
21, On no account, must you cheat in the exam.
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