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
Using must, should and ought to
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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
Time adverbs used with the present perfect tense
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The present perfect tense is commonly used with the indefinite time adverbs never, ever, before, yet, already. Have you ever been to the USA? I… Continue reading