[englishtext]We use "Yet \ Already" with Present Perfect

The adverbs "yet" & "already" are used to indicate that something has happened ( or hasn't happened ) at an unspecified time in the past .
These are adverbs are often used with the present perfect .

already ___ affirmative sentences
yet _______ negative sentences and questions

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Note : "Already" usually appears between the auxiliary and the main verb ; however it can appear at the begining or end of the sentence.
"yet" appears at the end of the sentence .

subject + (has or have) + already + (verb in past participle

subject + (has or have) + not + (verb in past participle) + yet

Examples :

We have already written our reports .

We haven't written our reports yet .

Maria hasn't called her parents yet .
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Note : Another option with the use of "yet" is something possible. In this case , the verb is positive and the adverb "yet" does not appear at the end of sentence.

Subject + ( has or have) + yet + (verb in infinitive

Examples :

Ahmed has yet to learn the material. = Ahmed hasn't learned the material yet .

We have yet to decide what to do with the money. = We haven't decided what to do with the money yet.

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Note : This use of "yet" should not be confused with the coordinating conjunction "yet", which means "but" .

Example :

I don't have the money , yet I really need the computer[/englishtext]

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