but
单词辨析：
侧重于排除在外，即从整体里除去。
I can answer all the questions except this one.
除了这个问题外，我可以回答所有的问题。
They all went to sleep except Tony.
除托尼之外，他们都去睡觉了。
词义同except，可换用，但语气较弱，且常与 nothing, nobody, anywhere, everything 等词连用。
We had nothing to do but/except wait.
除了等待之外，我们一筹莫展。
There was no one but/except me in the classroom.
教室里只有我一个人。
多用于引出使陈述不能完全成立的事物，有时也强调美中不足之处，通常只可后接名词或代词。
Your composition is good except for some spelling mistakes.
除了有几个拼写错误外，你的作文整体上写得很好。
The bus was empty except for one young lady.
公共汽车上很空，只有一位年轻的女士。
词义同 except，可换用，但略显过时。
We're all here save/except Tom.
除了汤姆，我们都在。
The window is never opened save/except in summer.
这扇窗户只在夏天打开。
相关例句：
I don't know about you, but I've had just about enough of this.
我不知道你怎么想，但我已经受够了。
He was a fine young man, but then so had his father been
他年轻有为，不过他父亲也曾经是。
It's true that I seem to have forgotten you, but it only seems that way.
我看起来好像确实是把你忘记了，但那只是看起来而已。
'B-b-b-b-but' I stuttered. — 'Never mind the buts,' she ranted
“但——但——但是”，我结结巴巴地说道。——“别跟我讲那些‘但是’了。”她咆哮道。
Please excuse me, but there is something I must say
不好意思，但有些话我必须说。
I'll need to talk with you, but there's no hurry
我得和你谈谈，但不着急。