will是个情态动词 不能做谓语 它要表示将来时态做谓语 后天必须接动词原形 be。换句话说，就是will不可以做谓语，而will be 可以做谓语。
Research will be needed as a preliminary to taking a decision.
作出决定之前需要进行研究。
This will give a yield of 10% on your investment.
这会给你的投资带来10%的利润。
It would be preferable to employ two people, not one.
雇请两个人比雇请一个更好。
We estimated it would cost about 5 000.
我们估计要花费大约5000欧元。
It would be interesting to know what he really believed.
了解他的真实信仰会是很有意思的。
The book will be invaluable for students in higher education.
这本书对于高校学生将有重大价值。
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