Years ago，if a teenager had some problems in his life，he might write them in his diary. Now he mig...

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has worked 　 was working 　 had been worked 　 had worked

was stopped being had stopped to be have stopped being had stopped being

when unless if before

he had considered had he considered he considered did he consider

were to have had had were having had

long ago before long long before three years ago

have had; are had; are had; is have had; is

they had been caught stealing salt they had sold salted fish they had taken salt from the king' s table they had used salt to preserve dead bodies

were to have had had were having had

were having had had were to have had

Two years ago For two years ago Since two years ago Since two years

were having had had were to have had

got had bought borrowed

has worked was working had been working had worked

before ago for 2 years since 2 years ago

had have had were having had had

there will be, there are there was, there will be there will be; there was there had; there will havE.

were to have had had were having had