just now 有刚才和现在的意思
1.刚才
She arrived just now.
她刚到.
2.现在
He is very busy just now.
他此刻很忙.
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so far 意思是 到目前为止
例：So far so good !到现在为止 一切都好（这是口语的精华句之一）
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up to now 是 目前为止的意思
例：Up to now,the work has been quite smooth.
到目前为止,工作很顺利.
刚才
到现在
到现在
so far ,up to now 的意思是一样的.
i have done so much work up to now.
i have done so much work so far.
这两个句子意思是一样的~(",)
just now 刚才
so far 迄今为止
up to now 直到现在