A.
1.That we need water is quite clear.
that we need water是主语从句,that 在主语从句中不充当成分,因为we 是主语need 是谓语,water 是宾语.
2.What we need is water.
what we need 是主语从句,what 在主语从句中充当宾语成分,we 是主语need 是谓语.
如何判断填that 还是what,要看需要什么成分,切记：在引导主语从句/宾语从句/表语从句时,that 不充当成分,而what 是充当主语/宾语/表语的. A.
1.That we need water is quite clear.
that we need water是主语从句,that 在主语从句中不充当成分,因为we 是主语need 是谓语,water 是宾语.
2.What we need is water.
what we need 是主语从句,what 在主语从句中充当宾语成分,we 是主语need 是谓语.
如何判断填that 还是what,要看需要什么成分,切记：在引导主语从句/宾语从句/表语从句时,that 不充当成分,而what 是充当主语/宾语/表语的.