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(at) the present time 现在；目前；此刻 Where are you living now? 你现在住在哪里？ They now have everything they wanted. 他们现在拥有了他们想要的一切。 We now know the truth. 我们现在知道真相了。 It's too late now. 现在太晚了。 It's been two weeks now since she called. 她上次来电距今已经有两个星期了。 I can tell you right now that you're wrong. 我现在可以告诉你，你错了。 I didn't receive the letter but it hardly matters now. 我没收到那封信, 不过现在这几乎没关系了。 - from now on
From now on I'll be more careful. 从今以后，我会更加细心。 - by now
He should be home by now. 他现在应该到家了。 - up till now
I've lived at home up till now. 我至今一直住在家里。 - for now
That's all for now. 暂时就这些。
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at or from this moment, but not before 现在；从现在开始 - (informal)
used to show that you are annoyed about something （表示厌烦） -
used to get somebody’s attention before changing the subject or asking them to do something （改变话题或要对方做某事前，引起对方注意）喂，哎，嗨
Word OriginOld English nū, of Germanic origin; related to Dutch nu, German nun, from an Indo-European root shared by Latin nunc and Greek nun.
Idioms
(every) now and again/then
from time to time; occasionally 有时；偶尔；时常
now for somebody/something
now, now
(also now then)
used to show in a mild way that you do not approve of something （温和地表示不赞同）可是，好啦 Now now, that's enough noise. 好了，够了。
now… now…
(it’s) now or never
this is the only opportunity somebody will have to do something 机不可失；勿失良机
now then
- (also now, now)
used to show in a mild way that you do not approve of something （温和地表示不赞同）可是，好啦 used when making a suggestion or an offer （提出建议或提供帮助）喂，听我说
now what? (informal)
- (also what is it now?)
used when you are annoyed because somebody is always asking questions or interrupting you （对某人的不断提问或打扰感到厌烦）又怎么了 ‘Yes, but Dad…’ ‘Now what?’ “是的，可是爸爸…” “又怎么了？”
used to say that you do not know what to do next in a particular situation （不知道下一步该做什么）现在该怎么办