把下列各句变成反义疑问句
11．Everyone is having a good time， ？
12．Nothing has happened， ？
13．What a fine day， ？
14．None of us knew him， ？
15．On the return journey，some of them lost their way， ？
16．You had to go to school by bike， ？
17．She had a good time yesterday， ？
18．You must study English hard next term， ？
19．He must be a teacher， ？
20．Few people knew these words， ？
参考答案：
11．aren 't they 12．has it 13．isn 't it 14．did w e 15．didn 't they 16．didn 't you 17．didn 't she 18．m ustn 't you 19．isn 't he 20．did they
