注意几种时态的区别：

( 1)一般现在时：表示经常、反复发生的动作或存在的状态。

We study hard at school every day.

He goes to school by bike.

( 2)一般过去时：表示在过去某个时候发生的动作或存在的状态，也表示在过去某段时间里经常发生的习惯性动作。

Did you go there last week?

I went to see my uncle yesterday.

( 3)一般将来时：表示在将来会发生的动作或存在的状态。

I’ ll come to see you next Sunday.

She is babysitting her sister this weekend.

We are going to Wuhan next Monday.

( 4)现在进行时：表示在说话时或现阶段正在发生的动作或存在的状态。

Is she listening to music?

He is having a meeting.

( 5)过去进行时：表示在过去某个时间正在发生的动作或存在的状态。

What was she doing when you came in?

They were watching TV when I went into the room.

( 6)现在完成时：表示在说话时刚刚结束的某一动作或状态。

I have learned English for 5 years.

Have you ever been to Singapore?

( 7)现在完成进行时：表示某一在过去开始，一直延续到现在，有可能刚刚结束，也有可能要继续下去的动作。

We have been skating for two hours.

She has been learning Chinese since she came to China.

注意各种时态的构成形式和不同功能。