用于本义，两者意为“与……一样好”，但good是形容词，而well是副词。用于引申义，两者的意思很不相同：as good as意为“几乎”“差不多”(=almost)；as well as表示“而且”。
as long as 是介词短语，一般接句子
1.As long as arranging the time reasonably,we are sure to benefit more from recreational activities.
其中的arranging ，并不是说该词后加动词ing形式，arranging 是句子arranging the time reasonably中的部分，是独立主格形式，它不能看作是as long as后加动名词。
2.as long as it isn't boring就是一个例子，而As long as do not rain!实际上是省略句，省略了it ，完整的用法是As long as it do not rain!至于什么时候省略，随着英语学习的加深，自然能够形成这种语感。
as long as其实有三个意思：
1) 只要 = so long as = while
如：You'll succeed as long as you work hard.
只要你好好学习,你就会成功的.
2）(长度上)和...一样长 / 长至...(程度)/ 长达...
如：The room is as long as 10 meters.
这个房间长达10米.
3）(时间上)和...一样久 / 久至.../ 长达...
如：I've lived here as long as 20 years.
我在此处居住长达20年之久.
as long as有三个用法:
1.During the time that (在这段时间):I'll stay as long as you need me.
2.Since (既然) :As long as you've offered,I accept.
3.On the condition that (条件是):I will cooperate as long as I am notified on time.
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