Look out!There comes a fierce dog. 小心,来了条凶狗。

　　Listen!There goes the first bell. 听，预备铃响了。

　　4.表示动作意义的动词，必须是习惯性的，经常性的动作或是一般性的行为才能使用一般现在时，而这种动词在现在进行时中则往往表示现在或现阶段正在进行的动作。

　　Light travels much faster than sound. 光比声音传播得快多了。

　　I sometimes work until dawn. 我有时工作到黎明。

　　5.有些词(如taste，smell，sound，look等)在一般现在时中是连系动词，而在现在进行时中则为行为动词。

　　I’m looking at the picture by Picasso. It looks really nice.

　　我正在看毕加索的画，它看起来太棒了。

　　The police dog is smelling the trace of the thief.

　　警犬正在嗅小偷的踪迹。

　　6.在时间，条件状语从句中，将来的动作须用一般现在时来表示。

　　If you fail again, I suggest you not lose heart.

　　如果你再次失败，我劝你不要灰心。

　　练习：

　　1. –Excuse me, where is lily?

　　-Oh, she the volleyball match on the playground.

　　A. watches B. will watch C. is watching D. watched

　　2. The summer vacation will begin next week. David to stay with us.

　　A. will be coming B. comes C. came D. is coming

　　3. –They about Super Voice Girl. Let’s join them. –Good idea.

　　A. talk B. are talking C. have a talk D. talked

　　4. Better go and ask him when he . We must see him off when he .

　　A. is leaving; leaves B. leaves; is leaving

　　C. leave; left D. left; was leaving

　　5. Jack is a black jacket today.