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takes; to work on spends; working on took; to work on spent; working on
every two weeks every second weeks every other weeks every two week
read reading to read on reading
Did you go Have you gone Have you been Had you gone
shall stay have stayed will have stayed have been staying
mustn’t haven’t didn’t hadn’t
two weeks ago since two weeks for two weeks before two weeks
have taken am about to take am taking was taking
mustn’t haven’t didn’t hadn’t
two weeks：is two—week；is two—week；are two weeks’；are
put out burnt out made out run out
mustn't haven't didn't hadn't
have taken am about to take am taking was taking
two weeks two weeks’ two-week two-weeks
my half of month salary my half salary month half monthly my salary half of my monthly salary
How often How long How soon How far
shall stay have stayed will have stayed have been staying
mustn't haven't didn't hadn't
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