Past perfect
Classified in English
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PRESENT CONTINUOUS They are buying the house The house is being bought
PAST SIMPLE They bought the house The house was bought
PAST CONTINUOUS They were buying the house The house was being bought
PRESENT PEFECT SIMPLE They have bought the house The house has been bought
PAST PERFECT SIMPLE They had bought the house The house had been bought
FUTURE SIMPLE They will buy the house The house will be bought
FUTURE PERFECT SIMPLE They will have bought the house the house will have been bought
BE GOING TO They are going to buy the house The house is going to be bought
MODAL They can buy the house The house can be bought
SEMI – MODAL They has to buy the house The house has to be bought
MODAL PERFECT They should have bought the house The house should have been bought