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Verb (Simple Tense (Simple past, Simple future, Simple present), Perfect…
Verb
Simple Tense
Simple past
Simple future
Simple present
Perfect Tense
Present Perfect ：现在完成时
indicates continued action
indicate continued effect of past action
ex： He has drawn on the beach.
可以帮助一个模糊的时间概念变得更清晰＝＝ when
At the same time: She will pay you when you ask her.
After: She will pay you when you has asked her.
过去完成时Past Perfect :had + past participle
当
before / after
出现的时候，可以不⽤用past perfect，⽽而使⽤用simple past。因为动作的先后顺序已 经⾮非常明显
Laura locked the door before she left.
也就是说，当句意已经表达非常清晰时，不一定需要过去完成时
Gmat 有时候会设陷阱，故意将需要用过去完成式的clause放在后面
ex：Theband U2 WAS just one of many new groups on the rock music scene in the early 1980s, but less than ten years later, U2 HAD fully ECLIPSED its early rivals in the pantheon of popular music.
注意语意，则可分析出时间的先后顺序
Conditional tense: would +verb
present+ future ( will do)
past+ conditional( would do)
主动和被动时态
在一句话里，主动和被动不需要平行
The shuttle launch TOOK place flawlessly and WAS SEEN on television