Phrase
until now
/ənˈtil nau/
adverb
至今；直到现在；到目前为止
up to the present time; used in a negative statement to describe a situation that has existed up to this point
- 1.
used in negative statement to describe a situation that has existed up to this point or up to the present time
用于否定句,表示从过去到现在一直存在的状况
用于否定句,表示从过去到现在一直存在的状况；到现在为止；迄今
In use
I haven't finished my homework until now.
We didn't know the truth until now.
She hadn't realized how important this was until now.
until now + present perfect
强调从过去到现在的经验空白，刚刚改变。
I have never been to Paris until now.
直到现在，我从未去过巴黎。
not ... until now
表示直到当前时刻才发生变化。
I didn't understand the problem until now.
直到现在我才明白这个问题。
Common mistakes
I have lived in Shanghai until now.I have lived in Shanghai so far.
在英语中，“until now”暗示情况刚刚改变（如之前没做，现在做了），但此处无变化，应使用“so far”或“up to now”表示持续到现在。
The train should arrive until now.The train should arrive by now.
“by now”表示预期某事应在此时或之前发生，而“until now”强调持续到此刻（常暗示结束），用于预期不当。
Connections
Dictionary facts from ECDICT.