will后面加什么形式

　　Had I known that I would never have come.

　　要是早知道，我絕不會來的。

　　It is estimated the project will last four years.

　　據估計，這項工程將持續四年。

　　This will not be possible in the changed economic climate.

　　這在經濟氣候已經改變的條件下是不可能的。

　　Research will be needed as a preliminary to taking a decision.

　　作出決定之前需要進行研究。

　　This will give a yield of 10% on your investment.

　　這會給你的投資帶來10%的利潤。