1樓：巧手成媽媽
1. i think (that) it's necessary for him to do this thing.
2. i think (that) it's necessary (that) he (should) do this thing.
3. i think (that) this thing is necessary for him to do.
4. i think (that) there is/exists necessity that he (should) do this thing.
5. i think (that) he should/will do this thing necessarily.
注：necessary不能用人做主語；「it's necessary that從句」中可以使用虛擬語氣。
2樓：匿名使用者
i think he has to do it.
3樓：我是真的小櫻
this is what i think he needs to do.
4樓：蝴蝶小貓咪
i think it's necessory for him to do.
i think he's necessory to do.
i think he should do.
i think he has the right to do.
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