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   (地基) should be laid before we build buildings.

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laid; laid; laid    laid; lay; lain    lied; laid; lain    lied; lying; laid  
laid    lay    should lie    had lain  
lied; had laid; had laid    lay; had lain; had laid    laid; lay; had laid    lied, had lied; had lain  
laid; laid; laid    laid; lay; lain    lied; lay; laid    lied; laid; lain   
had laid    had lain    had been laying    had been laid  
laid out  got on  put on  come on  
the relief valve should open before the high pressure cutout  the relief valve should open and allow the excess refrigerant to flow to the receiver  the high pressure cutout switch should operate before the relief valve opens  you should close in on the suction valve  
laid    lays    lay    lied  
be taken    should take    would be taken    have to be taken  
which    that    where    when  
lay; lay    laid; had laid    lay ; had laid   were lying ; had laid  
be taken    should take    would be taken    have to be taken  
More stress should be laid on the teaching of poetry.  The teaching of poetry is more important than any other subject.  One cannot enjoy life fully without an understanding of poetry.  Poetry is the foundation of all language and literature courses.  
had laid    lay    lied    should lie  
in, warned, after that    at, warned, before which    on, informed, after which    in, informed, before which  
should be finished    should finish    ought to have been finished    should have finished  
lies; lay    lied; lain    laid; laid    lay; laid  
the relief valve should open before the high-pressure cutout  the relief valve should open and let excess refrigerant go to receiver  the high-pressure cutout switch should operate before the relief valve opens  close in on the suction valve  
should become aware of    should have become aware of    should be aware of    could be aware of  
Every month  In every 3 months  In every 6 months  Every year  

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