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