after 前后时态与after 的位置有关吗The furnace was turned off six minutes after the last pellet had been charged.Six minutes after the last pellet was (had been) charged,the furnace was turned off.为什么后面的句子after后可以用

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after 前后时态与after 的位置有关吗The furnace was turned off six minutes after the last pellet had been charged.Six minutes after the last pellet was (had been) charged,the furnace was turned off.为什么后面的句子after后可以用
after 前后时态与after 的位置有关吗
The furnace was turned off six minutes after the last pellet had been charged.
Six minutes after the last pellet was (had been) charged,the furnace was turned off.
为什么后面的句子after后可以用过去式

after 前后时态与after 的位置有关吗The furnace was turned off six minutes after the last pellet had been charged.Six minutes after the last pellet was (had been) charged,the furnace was turned off.为什么后面的句子after后可以用
一般来说,过去完成时要比过去时在时间要更靠前.所以,不难看出,在做什么事情之后,下个事情才会发生.这样以来,after 后面接的是过去完成时,而主句是过去时.前后时态要吻合.

肯定的告诉你:没有

严格来说,这道题应该用过去完成时,但如果主句和从句的动作是紧跟着的,则可以用一般过去时。

旅游

过去完成时要比过去时在时间要更靠前