时态
一般
进行
完成
完成进行
现在时
Does; do
Am/is/are+doing
Has/have+done
Has/have+been doing
过去时
Did
Was/were+doing
Had done
Had been doing
将来时
Shall/will+do
Shall/will be +doing
Shall/will have + done
Shall/will+have been doing
过去将来时
Should/would/+do
Would/should+be doing
Should/would + have done
Would/should + have been doing
时态就是通过动词的形态变化,来表达动作发生的时间及所处的状态。
比如在They are doing their exercises.这个句子中,动词由原形do 变成are doing 的形态,说明这个事情是发生在现在、并处于正在进行的状态当中,所以叫现在进行时;
在They have done their exercises.这句中,动词由原形do 变成have done的形态,说明这个事情是发生在现在、并处于完成的状态,所以叫现在完成时;
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