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hadn’t haven’t had didn’t have hadn’t had
No, I hadn’t Yes, I had No, I didn’t Yes, I did
how I can open the door. if you watched TV last night. When did the program start. you had finished your homework.
can't mustn't must needn't
already, have watched yet, watched j
to do, took to do, spent doing, took doing, spent
if had he finished his homework. whether he had finished his homework if he had finished your homework. if you had finished your homework.
are supposed were supposed are supposing were supposing
easy much easier very easier more easier
wanted; wrote had wanted; was writing have wanted; wrote wanted; have been writing