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Modal verbs of deduction. Mary's late. She might be ill. She may be ill. She could be ill. can. could. base form. may. might. She's never late. She must be ill. I'm sure. No, I'm sure that's not true. She can't be ill. He can't be ill. now. He must be playing tennis.
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Modal verbs of deduction Vida Vidmar
Mary's late. Vida Vidmar
She might be ill. She may be ill. She could be ill. Vida Vidmar
can could base form may might Vida Vidmar
She's never late. Vida Vidmar
She must be ill. I'm sure. Vida Vidmar
No, I'm sure that's not true. She can't be ill. Vida Vidmar
He can't be ill. now He must be playing tennis. Vida Vidmar
Modal verb + base form PRESENT Modal verb +be+base form +-ing Vida Vidmar
He must have played tennis. yesterday He must have been playing tennis. Vida Vidmar
modal verb+have+past participle PAST modal verb + have+been+past participle Vida Vidmar
base form be + base form + -ing modal verb have + past participle have +been + base form+ -ing Vida Vidmar