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Mr. And: Mr. But、 Miss Or和我(and)来自于同一个家庭——并列连词。我们都可以连接相同成份的词、短语或句子。 如果我们连接的两个主语相同，或主语和谓语都相同时，后面一般不再重复前面的主语和谓语动词。我们仨又有许多不同之处, 我(and)连接两个并列或对称的词、短语或分句, 如：
You and I are students.
She will go and see her friends.
He likes English and Chinese.
He put on his coat and went out of the room. (前后主语一样，可以省略)
I went home and John stayed at the station. （前后主语不一样，不可以省略）
Mr. But: 是呵. 我(but)是用来连接两个含义不同，甚至是反义的词、短语或分句，表示一种转折，意思为 “但是， 然而，却”, 如:
Jim wasn’t here but his sister was.
We tried our best to do it but failed.
Miss Or: 我(or)的意思是 “或者,还是”，表示选择，两者、几者居其一。如：
Which book is better, this one or that one?
Is your friend a girl or a boy?
Which color do you like best, red, blue or black?
Mr. And: 值得一提的是: 有三个或三个以上的并列成份时, 我(and)只在最后两个成份之间出现。我在连接人称代词单数形式时，通常按第二、第三、第一人称的顺序排列，而当连接代词的复数形式时，通常按第一、第二、第三人称的顺序排列。例如：
You, he and I are good friends.我、你、他是好朋友。
We , you and they will go to play football together tomorrow.我们、你们和他们明天将一起去踢足球。
另外, 我(and)和Miss Or还能用于“祈使句 and/or 陈述句（一般将来时）”句型中：
Get up earlier tomorrow, and you will catch the early bus.
(=If you get up earlier tomorrow, you will catch the early bus.)
Get up earlier tomorrow, or you will miss the early bus.
(=If you don’t get up earlier tomorrow, you will miss the early bus.)
Miss Or: 我在用于“either...or...”连接对等成分时, 是“要么……要么……; 不是……就是……”的意思; 连接两个主语时应该遵循就近原则，即谓语动词的单复数形式取决于靠它近的主语形式。如:
Either you or I am wrong. (=Either I or you are wrong.)
如果把肯定句变为否定句, 被否定部分中“and”一般要变为“or”。
He likes watching TV and playing football.→He doesn’t like watching TV or playing football.
另外,“or so”是“大约”的意思（＝about），如：
There are20 flowers or so on the desk. (=There are about 20 flowers on the desk.)
Mr. But: 我(but)用于“Excuse me/ I’m sorry”后, 能起到使语气更委婉的作用，如：
Excuse me, but can you tell me the way to the hospital? 劳驾, 你能告诉我去医院的路吗？
I’m sorry, but I can’t go there with you. 很抱歉, 但我不能和你一起去那儿。
另外: “not ...but...”是“不是……, 而是……”的意思。连接两个主语时，谓语动词的单复数形式取决于but后的主语形式.如:
Not I but you are wrong.
Not you but I am right.
“nothing but ...”是“仅仅, 只”的意思。如:
There is nothing but a book on the desk. (=There is only a book on the desk.)桌上只有一本书而已。
责任编辑/张彩萍
You and I are students.
She will go and see her friends.
He likes English and Chinese.
He put on his coat and went out of the room. (前后主语一样，可以省略)
I went home and John stayed at the station. （前后主语不一样，不可以省略）
Mr. But: 是呵. 我(but)是用来连接两个含义不同，甚至是反义的词、短语或分句，表示一种转折，意思为 “但是， 然而，却”, 如:
Jim wasn’t here but his sister was.
We tried our best to do it but failed.
Miss Or: 我(or)的意思是 “或者,还是”，表示选择，两者、几者居其一。如：
Which book is better, this one or that one?
Is your friend a girl or a boy?
Which color do you like best, red, blue or black?
Mr. And: 值得一提的是: 有三个或三个以上的并列成份时, 我(and)只在最后两个成份之间出现。我在连接人称代词单数形式时，通常按第二、第三、第一人称的顺序排列，而当连接代词的复数形式时，通常按第一、第二、第三人称的顺序排列。例如：
You, he and I are good friends.我、你、他是好朋友。
We , you and they will go to play football together tomorrow.我们、你们和他们明天将一起去踢足球。
另外, 我(and)和Miss Or还能用于“祈使句 and/or 陈述句（一般将来时）”句型中：
Get up earlier tomorrow, and you will catch the early bus.
(=If you get up earlier tomorrow, you will catch the early bus.)
Get up earlier tomorrow, or you will miss the early bus.
(=If you don’t get up earlier tomorrow, you will miss the early bus.)
Miss Or: 我在用于“either...or...”连接对等成分时, 是“要么……要么……; 不是……就是……”的意思; 连接两个主语时应该遵循就近原则，即谓语动词的单复数形式取决于靠它近的主语形式。如:
Either you or I am wrong. (=Either I or you are wrong.)
如果把肯定句变为否定句, 被否定部分中“and”一般要变为“or”。
He likes watching TV and playing football.→He doesn’t like watching TV or playing football.
另外,“or so”是“大约”的意思（＝about），如：
There are20 flowers or so on the desk. (=There are about 20 flowers on the desk.)
Mr. But: 我(but)用于“Excuse me/ I’m sorry”后, 能起到使语气更委婉的作用，如：
Excuse me, but can you tell me the way to the hospital? 劳驾, 你能告诉我去医院的路吗？
I’m sorry, but I can’t go there with you. 很抱歉, 但我不能和你一起去那儿。
另外: “not ...but...”是“不是……, 而是……”的意思。连接两个主语时，谓语动词的单复数形式取决于but后的主语形式.如:
Not I but you are wrong.
Not you but I am right.
“nothing but ...”是“仅仅, 只”的意思。如:
There is nothing but a book on the desk. (=There is only a book on the desk.)桌上只有一本书而已。
责任编辑/张彩萍