1 I have sent my article to the client but he hasn’t paid me ( yet     already) 2  My brother has left the town so you are late a little bit. (already)

3  Have you  checked   your  test  ? (yet )

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1) I have already sent my article to the client but he hasn’t paid me yet

2) My brother has already left the town so you are late a little bit.

3) Have you checked your test yet?

Объяснение:

already - в утвердительных предложениях, ставим между вс и смысловым глаголом: have already sent

yet - в отрицательных и вопросительных предложениях, ставим в конце предложения.