With more and more forests destoryed, masses of soil are washed away every year.
我们一般都说had better not do sth.而不说hadn't better do sth. 这里习惯上可以把had better看做情态动词……
With more and more forests being destroyed, lots of soil is washed away by rainevery year.
You had better not stay up too late because you have to get up early tomorrow.
With more and more forests destroyed,large amounts of soil is carried away by the rainwater every year.
否定had better not do sth.
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