Form: has / have + past participle form of the verb Affirmative Negative Question I have worked. I have not worked. Have I worked? He… Continue reading
Using the present perfect tense
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Using must, should and ought to
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We use must in affirmative sentences to say what is necessary and to give strong advice and orders to ourselves or other people. Children must… Continue reading
Should with perfect infinitive
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Should can be used with the perfect infinitive (have + past participle). This structure has several meanings. Should have + past participle This structure is… Continue reading
Changing sentences in the simple present tense into passive
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When the active verb is in the simple present tense, we make passive verb forms with is/am/are + past participle form of the verb. Note… Continue reading
Passives: some special points
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Some verbs can be followed by two objects. The objects usually refer to a person (indirect object) and a thing (direct object). The indirect object… Continue reading