already 是否只能用于完成时态?

still,yet和already的用法
1.still
still强调过去发生的事情及存在的状况目前还在延续.在现在完成时的否定句中,still表
示吃惊或不耐烦的语气；但在现在进行时中,still只表示动作正在持续,不带有感情色彩.例如：
My neighbour hit my car last week and he still hasn't apologised.我的邻居上周撞了我的车,可他到现在还没有道歉呢.
He's still living with his mother.他仍与母亲住在一起.
2.yet
yet常用于疑问句和否定句.在疑问句中,用来询问说话人期望发生的事情是否已经发生.在否定句中,表示说话人期望发生的事情尚未发生.例如：
John,have you finished that report yet?约翰,你把报告已经写出来了吗?
John hasn't finished that report yet and I asked him for it three days ago.约翰还没有写完报告,可我三天前就要他交了.
3.already
already表示“已经”,常用于肯定句中.例如：
It's only 11 o'clock and they have already had lunch.现在才11点,他们已经吃过午饭了.
Are they building a new hotel here?There are too many hotels already.他们要在这儿建一个新饭店吗?这儿的饭店已经够多了.
[注] already偶尔也可用于疑问句,此时具有“惊奇”的意味.例如：
Have you finished the work already?You are very speedy.
你已经完成工作了吗?你的速度真快.
[例题] The moon ,everybody .
[答案] B．already改为yet.