شرح قاعدة Speculation and deduction: Past, present and future منهج Flying High 6

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58

Modal verbs of speculation and deduction – present and future

Use

• We use must when we are 90 per cent certain that something is true.

• We use may, might, could, may not, mightn’t when there is a 50 per cent possibility that something is true (or not).

• We use can’t when we are 90 per cent certain that something is not true.

Modal verbs of speculation and deduction – past

Use

• We use must have + past participle when we are 90 per cent certain that something was true.

• We use may have, might have, could have, may not have, mightn’t have + past participle when there is a 50 per cent

possibility that something was true (or not).

• We use can’t have + past participle when we are 90 per cent certain that something was not true.

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