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【时态】

1.一般现在时

表示普遍、经常性的或长期性的动作时使用一般现在时,它有：

Be 动词：She's a worker. Is she a worker? She isn't a worker.

情态动词：I can play the piano. Can you play the piano? I can't play the piano.

行为动词：They want to eat some tomatoes. Do they want to eat any tomatoes? They don't want to eat any tomatoes.

Gina has a nice watch. Does Gina have a nice watch? Gina doesn't have a watch.　　

2、现在进行时　　

表示动词在此时正在发生或进行就使用进行时态,结构为sb be v-ing sth   其它.　　

I'm playing baseball. Are you playing baseball? I'm not playing baseball.　　

Nancy is writing a letter. Is Nancy writing a letter? Nancy isn't writing a letter.　　

They're listening to the pop music. Are they listening to the pop music? They aren't listening to the pop music.