一、基本用法的差别1.as long as有两个意思,一是用于本义,意为“与……一样长(久)”,在否定句中,也可说成(not)so long as;二是用于引申义,表示“只要”,用于此义时也可说成so long as(不管是肯定句、否定句还是疑问句)。如:This river is as long as that one.这条河与那条河 First, the difference between the basic usage 1.as long as has two meanings, one for the original meaning, meaning “as long as ... (long)”, in the negative sentence, can also be said (not) so long as Second, it is used to extend the meaning of the meaning of “as long as” and it can also be said to be so long as (whether it is an affirmative sentence, a negative sentence, or an interrogative sentence). Such as: This river is as long as that one. This river and the river