1.now表明句子的時(shí)態(tài)應(yīng)該是現(xiàn)在時(shí)態(tài),包括現(xiàn)在進(jìn)行時(shí),一般現(xiàn)在時(shí)或現(xiàn)在完成時(shí).
如：
1）He is playing basketball now.現(xiàn)在進(jìn)行時(shí)
2）I'm free now.一般現(xiàn)在時(shí)
3）I've finished my homework now,so I can go out with you.現(xiàn)在完成時(shí)
2.不過(guò),有時(shí)候用其他時(shí)態(tài)也是可以的,如一般將來(lái)時(shí).
如：Now I'll intrdouce myself to you all.一般將來(lái)時(shí)