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PAST MODALS FOR SPECULATION
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(ALMOST 100% SURE) She forgot to call him.
She must have forgotten to call him.
Oops!
Okay!
(IMPOSSIBLE) He wasn't in his office.
He couldn't have been in his office.
Oops!
Okay!
(IMPOSSIBLE) They didn't buy a gift.
They couldn't have bought a gift.
Oops!
Okay!
(POSSIBLE) He painted this portrait.
He may have painted this portrait.
Oops!
Okay!
(IMPOSSIBLE) He didn't tell the truth.
He couldn't have told the truth.
Oops!
Okay!
(POSSIBLE) He didn't see me.
He may not have seen me.
Oops!
Okay!
(POSSIBLE) He went to the gym.
He may have gone to the gym.
Oops!
Okay!
(IMPOSSIBLE) They didn't shoot him.
They couldn't have shot him.
Oops!
Okay!
(ALMOST 100% SURE) He didn't tell the boss we were lying.
He must not have told the boss we were lying.
Oops!
Okay!
(ALMOST 100% SURE) She destroyed the mail box.
She must have destroyed the mail box.
Oops!
Okay!
(POSSIBLE) They built the pyramids.
They may have built the pyramids.
Oops!
Okay!
(Almost 100% sure) He didn't steal the wallet.
He must not have stolen the wallet.
Oops!
Okay!
(ALMOST 100% SURE) Mike ate the cake.
Mike must have eaten the cake.
Oops!
Okay!
(POSSIBLE) She sent the letter.
She may have sent the letter.
Oops!
Okay!
(IMPOSSIBLE) He didn't take the train.
He couldn't have taken the train.
Oops!
Okay!
(IMPOSSIBLE) Aliens didn't abduct her.
Aliens couldn't have abducted her.
Oops!
Okay!
(ALMOST 100% SURE) He was fired.
He must have been fired.
Oops!
Okay!
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