Already 和 yet 的区别简单，already 通常用于现在完成时或过去完成时的肯定句或疑问句中；而 yet 通常用于现在完成时的疑问句或否定句中；already 通常置于助动词 have/had 之后，而 yet 通常置于实义动词之后（也即句末）。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.3、I miss you so much already and I haven't even left _____.4、We might be hiring more people but nothing has been decided _____.5、After just one day, she had _____ made an enemy of her manager.6、It's late in the day to think of a change of plan when we have _____ ordered the materials.7、I hung my wet trousers on the radiator, but they are not dry _____ .8、Jason hasn’t phoned _____ .9、I've _____ seen that movie, so I'd rather see another one.10、She can't write _____, but she loves to scribble with a pencil.11、Poor Mary is so busy she hasn't had time to do the housework _____.12、She hasn't got over her health problems _____.13、John's planned the first phase of the project _____.14、Have you met the Jones's _____?15、It's _____ rained twice this morning.二、答案及解析 1、already解析：在肯定的现在完成时中用 already。2、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。3、yet解析：在否定的现在完成时且置于句末用 yet。4、yet解析：不定代词 nothing 具有否定意思，所以这里用 yet。5、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。
