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Present PerfectIf you're here for the first time, you may want to see a list of subjects that will make browsing this website more beneficial.
The Present Perfect is used to express actions that happened at an indefinite time or that began in the past and continue in the present. This tense is also used when an activity has an effect on the present moment.
Use
Time expressionsSince and for Since and for are very common time expressions used with the Present Perfect. We use for with a period of time, for example:
When talking about a starting point, we use since with a point in time.
More about time expressions Remember that in the Present Perfect you cannot use time expressions like:
Is there any difference between the Present Perfect Simple and Continuous?
Read Form
First of all, I'd like to tell you that the structure of this tense might seem a little more complicated than the structures of the tenses you already know. What we need this time are:  the proper conjugation of the verb "have" (=auxiliary verb) [1] the third form of the verb (=Past Participle ) [2][1] The conjugation of this verb is the same as in the Present Simple.
[2] Another piece of information we need to correctly form a sentence in the Present Perfect is the third form of the verb (always follows the auxiliary verb). Same as in the Past Simple, it can be either regular or irregular. The regular verbs are typically created by adding -ed. work -> worked While the irregular ones have to be memorized.
In positive sentences:
In sentences with adverbials such as ever, already and yet, Americans tend to use the Past Simple rather than the Present Perfect. So an American would probably say: Have you already gone to the post office?
In negative sentences:
Check your understanding!Present Perfect Simple or Continuous Present Perfect or Past Simple Exercise 2 (forming; negative sentences) Exercise 3 (forming; positive sentences) Present Perfect and Past Simple 1
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