now可以放在介词前面吗

now可以放在介词前面吗

now可以放在介词前面。比如词组from now on ，意思是从现在开始; 从此; 从今以后，now 在介词on的前面。

now的用法
　 now的用法1：now在句中除作状语外,还可作主语、表语或介词宾语。
　　now的用法2：now that可用作连词,作“由于…; 既然…”解, that可省略。例如:Now that you're grown up, you must stop this childish behavior.你既然长大了,你就必须去掉这种孩子式的举动。Now (that) John's arrived, we can begin.既然约翰来了,我们就可以开始了。
　　now的用法例句：
　　1. Husband and wife are now taxed separately on their incomes.
　　现在夫妻双方分别按各自的收入纳税。
　　2. A journalist all his life, he's now brought out a book.
　　他当了一辈子新闻记者，如今已出了一本书。
　　3. He will now face a disciplinary hearing for having an affair.
　　他因有外遇而要面临纪律听证会的裁决。
　　4. The crowds had been soaked and were now nicely drying out.
　　这群人都浑身湿透，现在谢天谢地快晾干了。
　　5. Shirley's brother is now a consultant heart surgeon in Sweden.
　　雪利的兄弟现在在瑞典做心脏外科高级顾问医师。
　　6. "I can't give you an answer now," he hedged.
　　“我现在不能回答你，”他闪避道。
　　7. The overhead light was covered now with a white globe.
　　现在，顶灯已装上了一个白色球状罩子。
　　8. Derek is now the proud father of a bouncing baby girl.
　　德里克现在为有一个健康活泼的女宝宝而骄傲。
　　9. The spokesman confirmed that the area was now in rebel hands.
　　这位发言人证实该地区现已落入叛乱分子手中。
　　10. Now there is a dawning realisation that drastic action is necessary.
　　现在人们开始意识到必须采取断然的行动。
　　11. It was time now to show more political realism.
　　现在是拿出更多政治务实精神的时候了。
　　12. Now is the time to touch him for a loan.
　　现在是向他借笔钱的时候了。
　　13. He was now a teacher and a respectable member of the community.
　　他现在是一位教师，并且是社区内受人尊敬的一员。
　　14. I know that you'vebeen studying chimpanzees for thirty years now.
　　我知道你研究黑猩猩至今已有30年了。
　　15. Now let me see, who's the man we want?
　　现在让我看一看，谁是我们要找的人?

当然可以
例如
from now on 从现在开始; 从此; 从今以后; 往后;
From now on you are free.
从今以后你自由了。