一般现在时
1.表经常发生的事情、存在的动作或状态
eg She sings with the band Crazy Boy.
2.表内心活动感情等
eg I don't think you are right.
3.描述客观真理
eg Birds fly in the sky.
4.表预定的行为
eg The train leaves at 9.
一般过去时
1.表过去发生的事情或存在的状态
eg Suddenly,the clouds cleared and the rain stopped.
2.表过去经常发生的事情
eg I was very thin in my childhood.
3.带有确定的过去的时间状语
eg Did you meet yesterday? He left just now.
一般将来时
1.要在将来的某个时间内发生,是“纯粹的将来动作”。
eg I shall / will not be free tomorrow.
2.表说话人的意图、打算或某种可能性
eg Who is going to speak first?
3.按计划要发生的动作或命令他人做某事
eg The new bridge is to open to traffic in 3 days.
现在进行时
1.说话、写文章的当刻正在发生的动作
eg They are having a football match.
2.现阶段一直在进行的动作
eg He is preparing for CET Band Six.
3.表示说话人的情感,如赞许、批评等
eg She is often doing well at school.
4.表示在近期按计划或安排要发生的动作
eg Are you staying here till next week?
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