yet和already的用法区别.

这两个字都表示 "已经", 而且都用在 句尾; 不过不同的是 yet 用在问句里, 而 already 用在肯定句里。在否定句里也可以用 yet 来表示 "还没有" 作某件事。

多看例句你会找到两者的区别了.
already =副词:已经
1. The children were already asleep when we got home.
2. Are you quitting already?
3. Enough already.(已经)够了
4. I had already gone when Tom arrived.
yet = 副词:仍然/尚未
1. The children were not asleep yet when we got home.
2. I am not quiting yet.
3. I haven't eaten enough yet.
4. He hasn't gone yet when Tom arrived.
5. We'll convince him yet [ 终于=finally] (我们终于说服他)
yet =连接词:
1. She said she would be late, yet [不过/但] she arrived on time.

两个字都表示 "已经"
yet 用在问句或否定句里,位于句尾;
而 already 用在肯定句里,位于句中,通常用于完成时态

两者一般都用在完成时句子，只是前者表否定，后者表肯定。