A.一般过去时表示某事在过去结束
B.positive form(肯定式)
1.规则动词的过去式以-ed结尾
2.不规则动词
3.除be动词外,其他动词过去式不随人称的不同而变化
C.negative(否定式)和question(疑问式)【使用动词原形】
1.did用于否定式和疑问式中
I/you/he didn't stop.
did I/you/he stop?
2.was和were用于否定式和疑问式
I wasn't very well.
was I ?
A.一般过去时表示某事在过去结束
B.positive form(肯定式)
1.规则动词的过去式以-ed结尾
2.不规则动词
3.除be动词外,其他动词过去式不随人称的不同而变化
C.negative(否定式)和question(疑问式)【使用动词原形】
1.did用于否定式和疑问式中
I/you/he didn't stop.
did I/you/he stop?
2.was和were用于否定式和疑问式
I wasn't very well.
was I ?
A.I have done or I did现在完成时涉及过去和现在 The plane has just landed.一般过去时涉及过去 ,已经结束的某个时间。 The plane landed ten minutes ago
A.过去完成时和过去完成进行时过去完成时:I had taken a bus into town.过去完成进行时: I had been swimming in the poolB.形式 positive form: I had&
一. PI 说明转自 Oracle RAC Concept of Past Image (PI) on of
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