1. Now he doesn't come,let's start our meeting. 既然他不能来了，咱们就开始开会吧。
2. I think so before, but not now. 我曾经这样认为，但不是现在。
3. Now they are a city of trees. 而如今他们是一棵城市的树。
英英解释
n.
1. the momentary present
2. at the present moment
3. in these times
4. in the historical present; at this point in the narration of a series of past events
5. (prefatory or transitional) indicates a change of subject or activity
6. used to preface a command or reproof or request
7. without delay or hesitation; with no time intervening
8. in the immediate past
