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新概念英语第一册 语法点总结
Lesson87-88
语法点总结：
yet的用法
yet 与 already 的区别
already常用于肯定句。但是表示“惊讶”时，可用于疑问句句末。
already用于表明某事很早已经发生过。它位于句子中间，通常用于现在完成时。
在美式英语中already也可以用于一般过去时。
英式英语:
I have already done my homework. 我已经完成了我的作业。
He has already washed the car. 他已经洗了车。
美式英语:
I already did my homework. 我已经完成了我的作业。
He already washed the car. 他已经洗了车。
The movie has already been on for 5 minutes.电影已经开演5分钟了。
Have you had dinner already 你已经吃过晚饭了 （表示惊讶,可能那个人晚饭吃得太早了）
yet常用于否定句、疑问句。
The goods haven't arrived yet. 货还没有到。 Have you done your homework yet 你已经做完作业了吗
Yet用于谈论期待发生，
但到此刻仍未发生的事情，
指“到目前为止的任何时间”。
Yet用于疑问句和否定句中。
Yet通常与现在完成时态连用，
一般用于句子末尾。
Have you finished your homework yet – Interrogative
你已经做完你的作业了吗？- 疑问句
I haven’t washed my car yet. – Negative
我还没洗过车。- 否定
Yet很少用于肯定句，但是当它被使用于肯定句时，它有否定含义。
I have yet to read the ‘Harry Potter and the Goblet of Fire’ book.
我还没有读过《哈利波特和火焰杯》一书。
补充：Just：
当我们想要表达不久以前（最近）发生的事情时，就会使用just。它常与现在完成时或过去完成时一起使用。
它常用在辅助动词（have / has）和过去分词之间，可以用于肯定和疑问句。
I’ve just called my grandmother. (Present Perfect)
我刚刚打电话给我的祖母。（现在完成时）
We had just finished dinner. (Past Perfect)
我们刚吃完晚餐。 （过去完成时）
注意：在美式英语中，只能与一般过去时一起使用。
I just saw him outside. 我刚看到他在外面。
知识拓展：
现在完成时可以在以下句型中表示"这是…有生以来…",有很强烈的感彩。
① It/This is the+序数词+ time （that）…
It's the first time I have visited the Imperial Palace.这是我第一次参观故宫。This is the second time I have seen such an exciting film.这是我第二次看这样一部激动人心的电影。
② It/This is the+形容词最高级/序数词+名词+（that）…
It's the first meal he has had for a whole day.这是他这一整天吃的第一顿饭。This is the most correct decision I have made thus far.到目前为止,这是我做的最正确的决定。
专项练习：
一、用 already 或 yet 完成下面的句子
1、I've _____ discussed my plans with Mom, and she's going to watch Tammy.
2、Joey is under-aged, but he's _____ in training for the big race against Bailey.
I miss you so much already and I haven't even left _____.
We might be hiring more people but nothing has been decided _____.
After just one day, she had _____ made an enemy of her manager.
It's late in the day to think of a change of plan when we have _____ ordered the materials.
I hung my wet trousers on the radiator, but they are not dry _____ .
Jason hasn’t phoned _____ .
I've _____ seen that movie, so I'd rather see another one.
She can't write _____, but she loves to scribble with a pencil.
Poor Mary is so busy she hasn't had time to do the housework _____.
She hasn't got over her health problems _____.
John's planned the first phase of the project _____.
Have you met the Jones's _____
15、It's _____ rained twice this morning.
二、用already, just, still / yet来填空。
My parents _____ haven't bought a new car.
My parents haven't bought a new car_____ .
My parents have _____ bought a new car_____.
Aaron hasn't visited his brother _____.
Aaron hasn't _____ visited his brother.
Aaron _____ hasn't visited his brother.
答案&解析：
用 already 或 yet 完成下面的句子
already解析：在肯定的现在完成时中用 already。
already解析：在美式英语中，already 有时还用于一般过去时，且一般多用于口语中，但是有些美国人还是认为这种用法是不可取的，所以在实际应用中要尽量避免，但是在这里用 yet 是行不通的。
yet解析：在否定的现在完成时且置于句末用 yet。
yet解析：不定代词 nothing 具有否定意思，所以这里用 yet。
already解析：在过去完成时的肯定句中只用 already。
6、already解析：同题1。
7、 yet解析：在否定句中，yet 用来表明尚未发生但在将来有可能发生的事情。
8、yet解析：在否定句或疑问句中，yet 用来表明尚未发生但在将来有可能发生的事情，表明说话者的期待。
9、already解析：同题1，yet 不能用来指代已经发生的事情，指代已经发生的用 already。
10、yet解析：yet 用在否定句中，译为”还，尚“，表示某事以后会做但现在不要或不能做。
11、yet解析：在否定的现在完成时且置于句末用 yet。
12、yet解析：同题11。
13、already解析：当 already 用来加强强调或表示更大的惊奇时，置于句末，主要用在非正式场合的口语中。
14、yet解析：在现在完成时的疑问句中且置于句末用 yet。
15、already解析：在肯定的现在完成时中用 already。
二、用already, just, still / yet来填空。
still, yet, already
yet, already,still

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