Had I known that I would never have come.
要是早知道，我绝不会来的。
It is estimated the project will last four years.
据估计，这项工程将持续四年。
This will not be possible in the changed economic climate.
这在经济气候已经改变的条件下是不可能的`。
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。