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Also known as present perfective, this is an aspect of the verb expressing that an action began in the past and it has recently been completed or it continues into the present.
The present perfect is formed by combining the auxiliary has (for he, she, it) or have with the past participle, i.e. the third principal form of the main verb, as follows:
Regular Verbs For regular verbs the past participle is the same as the past simple tense, which is formed by adding -d or -ed to the present form of the verb. There are certain rules for these terminations.
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Irregular Verbs For irregular verbs this usually ends in -d, -t, or -n and you learn these from a list of irregular verbs. I strongly advise you to keep revising these verbs regularly, otherwise you forget them easily and then you'll always be faced with difficulties exactly when you need them most.
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Here are a few examples:
Here we are not interested in the action, but in the completed fact and its relationship to a given general time aspect. This is expressed by the Perfect Tenses.
In the sentence [I've bought a hat.] we are calling attention to the possession of the article and not to the act of buying. But if we add 'yesterday' we must say [I bought a hat yesterday.], because now we automatically put our attention onto the actual action of buying.
The form 'I have bought' is naturally considered in relation with NOW.
This creates confusion for many people whose native language is not English. Common mistakes are mixing the Present Perfect with the Present Perfect Continuous or the Past Simple. Consider this:
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Note that the actions in sentences 2. and 4. were completed at some point in the past. The exact point of their completion is not important here, hence there's no mentioning of it. What's important is that the actions are completed now and we can prove this - we have the result.
Variation: In American English, there is a tendency to use the Past Simple tense instead of the Present Perfect. (David Crystal, Rediscover Grammar. Pearson Longman, 2004)
American English
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British English
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