9．can, nothing/can't, anything．You can see nothing in the room．和 You can't see anything in the room．同义。

8．haven't, yet。在肯定句中用already，疑问句和否定句中用yet。

6．wasn't done 7．isn't any

5．didn't do．didn't为助动词， do为实意动词。

4．don't have．have(has？)作“有”讲时，变疑问句时可将其移到主语前面，也可变为 Do (Does) +主语+ have…？变否定句时可在其后直接加 not，或“don't(doesn't) have”。但如果have作行为动词，则只能加助动词do的各种形式，而不能象连系动词be那么变了。

3．hasn't any．疑问句中用some，疑问句和否定句中用 any．

2．doesn't walk

1．isn't

18．B．How many times是问次数，have been to是指“去过某处”，句中疑问词与谓语动词的衔接表示非延续的动作，故不能和 How long或 since when连用。

Ⅱ．

17．D．Let's祈使句的附加部分用Shall we。