Just/yet/already (present perfect)

We use JUST with the Present Perfect to talk about things that happened a short time before now. 

Mary has just arrived from Italy. 

They have just written to their parents. 

My colleagues have just finished work. 

The child has just finished his milk. 

We use ALREADY with the Present Perfect to emphasize that something happened before now, or before it was expected to happen. 

She has already taken a meal. 

They have already cleaned the house. 

My siblings have already eaten. 

My mother has already prepared dinner. 

We use YET with a negative verb to say that something has not happened, but we think that will happen. 

She hasn’t been to Spain yet. 

They haven’t finished their work yet. 

We use YET in questions to ask if something, that we expect to happen, has happened. s

Has she been to Spain yet? 

Have they finished your work yet? 

Has she posted the letter yet? 

We usually put yet at the end of a negative statement or question.