你是要句子还是希望知道怎么用，
这样，如果你是想要知道有什么区别，看这里：
I've already gone there
I've just gone there
I haven't gone there yet
三个词的特点：大多用于过去分词句中，意思我就不用解释了吧？要豪华一点的造句而已？看这里（呵呵）：
The match was already finished when i finally reached the field through the rain~(开始的地方不用has用was是过去分词的过去式，和后面的reached一致）
I have already done the whole work by myself without any helps
You've already been questioning me for 2 hours but i just don't got the idea.

The plane has just left as it should.
You've just forgotten your pencils at the door.
The class had just begun as we heard the ring.

The work was so hard, yet no body has finish it at all.
（这是一种特殊用法，yet可以加句首)
She hasn't had the lunch yet--够普通哈~
I haven't finished your question yet but soon i will.

呵呵呵呵~没有功劳也有苦劳阿