單字解析
1. It's my treat. 由我作東。    
treat n. & vt. 請客
treat + 人 + to dinner   請某人吃飯/看電影
                   a movie
例:Uncle Jim said he would treat us all to dinner tonight.
(吉姆叔叔說今晚要請我們大家去吃晚餐。)
2. Have you eaten yet? 你吃過了嗎?
yet的用法:
a.使用於現在完成式的否定句中, 與not並用, 形成下列的用法:
have not...yet  尚未……, 還沒……
例:He has not come back yet.
(他尚未回來。)
I haven't heard from him yet.
(我還沒收到他的音訊。)
b.用於現在完成式的疑問句中, yet通常置於疑問句之句尾, 作強調語氣, 也可予以省略; 換言之, yet不具特別意義, 故不必翻譯出來。
例:Has he come back (yet)?
(他已回來了嗎?)
Have you done it (yet)?
(這件事你做完了嗎?。)
至於already亦可表示『已經』的意思, 通常用於肯定句中, 若用於問句則表示強調驚訝的語氣, 不可使用於否定句中。
例:He has come back already.
= He has already come back.
(他已經回來了。)
I have done it already.
= I have already done it.
(我已經把這事做完了。)
Has he come back already?
(他真的已經回來了啊?)
Have you done it already?
(你真的已經做完了啊?)
3. I haven't, either. 我也還沒吃。
*此處either是副詞, 專用於否定的簡應句中。簡應句有肯定簡應句 (即簡答句) 及否定簡應句之分。
a.肯定簡應句與so或too連用。與so連用時, 簡應句須採倒裝句子結構; 與too連用時, 簡應句不須倒裝。
1)與be動詞連用:
例:He is nice, and so is she.
= He is nice, and she is, too.
(他人很好,她也很好。)
He was going home, and so was she.
= He was going home, and she was, too.
(他即將回家,她也是。)
2)與助動詞連用:
例:He will come, and so will she.
 = He will come, and she will, too.
(他要來,她也要來。)
   He has gone, and so has she.
= He has gone, and she has, too.
(他走了,她也走了。)
3)與一般動詞連用:
例:He came, and so did she.
= He came, and she did, too.
(他來了,她也來了。)
He has a book, and so does she.
= He has a book, and she does, too.
(他有書,她也有。)
b.否定簡應句用neither、 nor或either。
neither與either皆為副詞, 故and不可省略; nor則為連接詞, 前面不必置and。使用neither與nor時須使用倒裝句子結構, 而使用either時則與not並用, 不須倒裝。
1)與be動詞連用:
例:He isn't nice, and neither is she.
 = He isn't nice, nor is she.
 = He isn't nice, and she isn't, either.
(他不好,她也不好。)
   He wasn't going home, and neither was she.
= He wasn't going home, nor was she.
= He wasn't going home, and she wasn't, either.
(他不回家,她也不回家。)
2)與助動詞連用:
例:He won't come, and neither will she.
  = He won't come, nor will she.
  = He won't come, and she won't, either.
(他不來,她也不來。)
   He hasn't gone, and neither has she.
= He hasn't gone, nor has she.
= He hasn't gone, and she hasn't, either.
(他沒去,她也沒去。)
3)與一般動詞連用:
例:He never tells a lie, and neither does she.
  = He never tells a lie, nor does she.
  = He never tells a lie, and she doesn't, either.
(他絕不說謊,她也絕不說謊。)
  He has no book, and neither does she.
= He has no book, nor does she.
= He has no book, and she doesn't, either.
(他沒有書,她也沒有。)

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