Предложения с already:

I have already finished my homework.She has already left for the airport.Have you already eaten dinner?The movie has already started.

Предложения с just:

I have just arrived home from work.He has just finished reading the book.Just give me a minute to think about it.I just saw her at the grocery store.

Предложения с yet (отрицательные):

I haven't finished my project yet.They haven't returned from their trip yet.She hasn't called me back yet.

Предложения с yet (вопросительные):

Have you finished your homework yet?Has the package arrived yet?Have they made a decision yet?