Many teachers believe it----------(necessary) to give students tests every week.要加be动词吗?

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Many teachers believe it----------(necessary) to give students tests every week.要加be动词吗?
Many teachers believe it----------(necessary) to give students tests every week.
要加be动词吗?

Many teachers believe it----------(necessary) to give students tests every week.要加be动词吗?
可以加,也可以不加,都是对的.
加is,则believe 后面是个宾语从句,不加则是个简单句,it做形式宾语,真正的宾语是后面的不定式to give students tests every week.
一些动词,如believe/think/find/suppose/feel/等,believe/think/find/suppose/feel it +adj+to do sth=believe/think/find/suppose/feel/ +(that)+it be+adj+to do sth.

要加
is necessary

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可以加，可以不加。
不加的情况，这样断句：Many teachers \ believe it necessary \ to give students tests every
week.
believe it necessary 是[ VN-adj ] 结构，及物动词后接宾语，再接形容词作补语。
加的情况，这样断句：Many teachers \ believe（that) \ it is necessary \to give students tests every week.
believe是动词，在believe后面接用that引导的宾语从句（that可以省略）。
两种情况意思一样。

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