一,as far as 到,程度,遠(yuǎn)到.和,一樣遠(yuǎn)
1.As far asI know,he is kind.
就我所知,他人不錯(cuò).
2.Yesterday we walked as far as the end of the river.
二.so far as 用于否定句,意思是：沒有遠(yuǎn)到,
He didn't walked as far as the park.他昨天還沒走到公園.
三.so far到目前為止.用于現(xiàn)在完成時(shí).
So far we have learned 2000 words.
四.as long as 只要.和,一樣長
As long as you work hard ,you will succeed in time.
The river is as long as that one.
五.so long as 只要,不及,長（用于否定句）
So long as you can take care of my book,you can read it .
The river is not so /as long as that one.