but

音標(biāo)發(fā)音

but的基本意思相當(dāng)于in spite of this或表示與所預(yù)料的不一樣,意為“但是,然而,盡管如此”，不與though,although連用。
but可用來表達(dá)諸如憤怒、吃驚等強(qiáng)烈的感情，用來加強(qiáng)語氣，也可用在表示歉意的句子里，常不譯出，還可用于改變話題，意為“無論如何”“反正”“好”。
如果but接動詞不定式,當(dāng)前面有do或cannot時(shí),不定式不帶to; 當(dāng)前面有anything, everything, nothing等詞時(shí),不定式常不帶to,但也有例外; 其余情況帶to。
與but連用的too...to do結(jié)構(gòu)不具有否定意義。
如果主句含有hardly,never,never so,not so,not such等詞，可用but,but that或but what引導(dǎo)表示結(jié)果的狀語從句，構(gòu)成雙重否定，相當(dāng)于that...not或unless，譯作“沒有…不”“若…，就一定”。
如果but that引出的分句描述的是真實(shí)情況，而主句描述的是非真實(shí)的情況，則主句多用虛擬語氣，此時(shí)譯作“假如沒有…”“要不是”
not but that...是it is not but that的省略法, but無否定意義,譯作“雖然…可是…”。
在not...but...結(jié)構(gòu)里，可以不借助do(does)來否定動詞，而否定其他成分，譯作“不是…而是”。

used to introduce an added statement, usually something that is different from what you have said before
except
(FOR EMPHASIS) used to give force to a statement
(ONLY) only; just
used to emphasize that something will happen even if the person you are talking to does not want it to

You use but to introduce something that contrasts with what you have just said, or to introduce something that adds to what you have just said.
You use but when you are about to add something further in a discussion or to change the subject.
You use but after you have made an excuse or apologized for what you are just about to say.
You use but to introduce a reply to someone when you want to indicate surprise, disbelief, refusal, or protest.
But is used to mean "except."
But is used to mean "only."
You use but for to introduce the only factor that causes a particular thing not to happen or not to be completely true.
You use but then or but then again before a remark which slightly contradicts what you have just said.
You use but then before a remark which suggests that what you have just said should not be regarded as surprising.
all but&rarrsee all
anything but&rarrsee anything