英语从句有哪几种?请举例说明.下面有几个句子,请说出是哪种从句.

英语从句有哪几种?请举例说明.下面有几个句子,请说出是哪种从句.
Fewer people will do such jobs in the future ({ because they are borin }).
However,some scientist bilieve ({ that althaugh we can make robots }).
For example,scientist James White thinks ({ that robots will never be able to wake up and know where   they are }).
They think ({that robots will even be able to talk like humens in 25 to 50 years.})
However,they agree ({it may take hundredsof years.})
In India,for example,scientists made robots ({that look like snakes.})
If ({buildings fall down with people inside}),these snake robots can help look for people under the buildings.
We never know ({what will happen  in the future.})

最好十一点以前