介绍:
表语从句：
例句：
The question is whether we can finish our work by tomorrow evening.
同位语从句
例句：
We can not deny the fact that Beiing, at the moment, is not as green a city as what we like it to be.
中间用冒号，或“即”来连接
The scientists made an exciting discovering that this waste material could be tumed into plastics.
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