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Chapter 20
20.1.2
Modal verbs and compound tenses II
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Chapter 20: Modal verbs (Auxiliaries)
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20.1.2 Modal verbs and compound tenses II
The English version of compound tenses with modal verbs has follows the logic that the modal verb is put after the subject and the compound tense is unchanged appended with the infinitive form of 'to have' and the perfect participle.
subject
+ modal verbs
+ infintive of to have
+ perfect participle
He
should
have
known
He
could
have
been
He
must
have
done
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