but

音标发音

but的基本意思相当于in spite of this或表示与所预料的不一样,意为“但是,然而,尽管如此”，不与though,although连用。
but可用来表达诸如愤怒、吃惊等强烈的感情，用来加强语气，也可用在表示歉意的句子里，常不译出，还可用于改变话题，意为“无论如何”“反正”“好”。
如果but接动词不定式,当前面有do或cannot时,不定式不带to; 当前面有anything, everything, nothing等词时,不定式常不带to,但也有例外; 其余情况带to。
与but连用的too...to do结构不具有否定意义。
如果主句含有hardly,never,never so,not so,not such等词，可用but,but that或but what引导表示结果的状语从句，构成双重否定，相当于that...not或unless，译作“没有…不”“若…，就一定”。
如果but that引出的分句描述的是真实情况，而主句描述的是非真实的情况，则主句多用虚拟语气，此时译作“假如没有…”“要不是”
not but that...是it is not but that的省略法, but无否定意义,译作“虽然…可是…”。
在not...but...结构里，可以不借助do(does)来否定动词，而否定其他成分，译作“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