I had not seen any for over a week .

我已经有一个星期没有看见云了。

His mother must have seen him drive up .

他母亲一定是看见他的车子开过来了。

We want to be seen and acknowledged .

我们希望被看见，被认识。

He heard what he had not yet seen .

他听见了还没看见的事情。

She had seen nothing , and fainted .

她什么都没看见，晕了过去。