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yet的用法:
1.用作连词时，与but一样主要用于转折，意为“但是”“而”。如：
I have failed, yet I shall try again. 我失败了，但我还要尝试。
The judge was stern, yet completely fair. 法官很严厉，却完全公正。
They are the same, yet not the same. 它们一样，但又不一样。
It is strange, yet it is true. 那真是怪事，然而却是事实。
I’ve been away only for three years, yet I can hardly recognize my hometown.
我仅在外三年，可我几乎认不出我自己的故乡了。
He said he was our friend, yet he wouldn’t help us. 他说他是我们的朋友，但却不肯帮助我们。
2.有时用在句首。如：
Yet the house was cheerful. 但屋子里显得很欢快。
Yet its population has doubled. 但它的人口翻了一番。
3.有时可与并列连词and或but连用，构成习语and yet和but yet，且两者大致同义(均相当于表转折的but)。如：
I gave him ten pounds (and) yet he was not satisfied. 我给了他十镑但他仍不满足。
She’s vain and foolish, and yet people like her. 她很虚荣且愚蠢，但人们却喜欢她。
She drove very fast to the airport, but/yet/and yet she missed the plane.
她开快车去机场，可还是误了飞机。
4.although不能与表示转折的but连用，但是却可以与yet连用。如：
Although we have made some progress, yet we still have a long way to go.
我们虽然取得了些进步，但还是远远不够的。
but的用法:
1.用作连接词或短语。如：
It was a sunny but not very warm day. 那一天天气晴朗，却不太暖和。
He drives not carefully but slowly. 他开车不是很小心，但是很慢。
2.用于连接句子。如：
This isn’t a good one but it will answer. 这不太好，但是有效。
He looks honest, but actually he’s a rogue. 他看起来很老实，实际却是一个坏蛋。
She has said “Good morning” to him， but he gave no answer.
她向他说了早上好，但他没有回应。
The ice remained, but there was no water underneath. 冰还在，但下面却没有水。
Mrs. Brown was about to begin, but Jennie spoke first. 布朗夫人正要开始讲话，珍妮先讲了。
At first he was a little shy, but now he acts more natural.
开始时他有些腼腆但现在他表现得很自然了。
There was a little trouble at first, but things were soon quiet.
起初有点小麻烦但后来事端就平息了。
3.用于句首。如：
But that question doesn’t arise. 但没发生那个问题。
But in secret she was delighted. 但她暗中感到高兴。
But what else can we do? 可是我们还能做什么?
But in the end he gave in. 但最后他还是让步了。
But there’s one thing we are agreed on. 但有一点大家的意见是一致的。
4.用于道歉的表达之后。如：
Sorry, but we’re behind schedule. 抱歉，我们落在计划后了。
I’m frightfully sorry, but I can’t see you today. 太对不起了，我今天不能见你。
Excuse me, but I don’t think that’s quite true. 很抱歉，我认为这与事实略有出入。
5.用于not…but…，表示“不是……而是……”。如：
Not you but I am to blame. 不是你的错而是我的错。
6.用在某些否定词后，表示“只……”。如：
He eats nothing but hamburgers. 他只吃汉堡包。
You have nobody but yourself to blame. 只能怪你自己。
No one but me saw her. 只有我看见她了。
7.用于next(last) but one 中，表示“隔壁再过去”“倒数第……”。如：
He lives in the next house but one. 他住在隔壁再过去一家。
He was the last but one to arrive. 他是倒数第二个到的。
8.can’t help but 不得不…… 如：
You can’t help but respect them. 你不得不尊敬他们。
I can’t help but admire his courage. 我不得不赞赏他的勇气。
注意:不要按汉语意思将“虽然……但是……”直译为although/though…but…：
误：Though we are poor, but we are happy. (去掉though或but)
or的用法:
1.表示选择，意为“或，还是”。如：
Is the radio off or on? 收音机关了还是开着?
Would you prefer tea or coffee? 你喜欢茶还是咖啡？
Is he asleep or awake? 他睡着了还是醒着?
Are you going to America by boat or by air? 你去美国是坐船还是坐飞机？
2.表示一种否定的条件，意为“否则”。如：
Hurry up, or you’ll be late for school. 赶快，否则你上学就要迟到了。
Dress warmly, or else you’ll catch cold. 穿暖和点，否则你会感冒的。
Be careful, or you’ll break that vase!小心，否则你会把那花瓶打碎的!
3.表示“要不就是”。如：
He must be joking, or else he’s mad. 他一定在说笑话，要不就是疯了。
The book must be here, or else you’ve lost it. 这书一定在这儿，要不就是你弄丢了。
4.用于否定句中代替and。如：
He was not clever or good-looking. 他不聪明，长得也不好看。
比较：They sang and danced. 他们既唱歌又跳舞。
They didn’t sing or dance. 他们既没有唱歌也没有跳舞。
5.用于习语。如：
The work is more or less finished. 工作多少做了一点儿。
They consist of 1700 or more tribes. 他们由1700个或更多部族组成。
There’s just one or two details I want to make sure about. 还有一两个细节我想弄清楚。
Either your mother or your father may come with you. 你母亲或是你父亲会陪你去。
1.用作连词时，与but一样主要用于转折，意为“但是”“而”。如：
I have failed, yet I shall try again. 我失败了，但我还要尝试。
The judge was stern, yet completely fair. 法官很严厉，却完全公正。
They are the same, yet not the same. 它们一样，但又不一样。
It is strange, yet it is true. 那真是怪事，然而却是事实。
I’ve been away only for three years, yet I can hardly recognize my hometown.
我仅在外三年，可我几乎认不出我自己的故乡了。
He said he was our friend, yet he wouldn’t help us. 他说他是我们的朋友，但却不肯帮助我们。
2.有时用在句首。如：
Yet the house was cheerful. 但屋子里显得很欢快。
Yet its population has doubled. 但它的人口翻了一番。
3.有时可与并列连词and或but连用，构成习语and yet和but yet，且两者大致同义(均相当于表转折的but)。如：
I gave him ten pounds (and) yet he was not satisfied. 我给了他十镑但他仍不满足。
She’s vain and foolish, and yet people like her. 她很虚荣且愚蠢，但人们却喜欢她。
She drove very fast to the airport, but/yet/and yet she missed the plane.
她开快车去机场，可还是误了飞机。
4.although不能与表示转折的but连用，但是却可以与yet连用。如：
Although we have made some progress, yet we still have a long way to go.
我们虽然取得了些进步，但还是远远不够的。
but的用法:
1.用作连接词或短语。如：
It was a sunny but not very warm day. 那一天天气晴朗，却不太暖和。
He drives not carefully but slowly. 他开车不是很小心，但是很慢。
2.用于连接句子。如：
This isn’t a good one but it will answer. 这不太好，但是有效。
He looks honest, but actually he’s a rogue. 他看起来很老实，实际却是一个坏蛋。
She has said “Good morning” to him， but he gave no answer.
她向他说了早上好，但他没有回应。
The ice remained, but there was no water underneath. 冰还在，但下面却没有水。
Mrs. Brown was about to begin, but Jennie spoke first. 布朗夫人正要开始讲话，珍妮先讲了。
At first he was a little shy, but now he acts more natural.
开始时他有些腼腆但现在他表现得很自然了。
There was a little trouble at first, but things were soon quiet.
起初有点小麻烦但后来事端就平息了。
3.用于句首。如：
But that question doesn’t arise. 但没发生那个问题。
But in secret she was delighted. 但她暗中感到高兴。
But what else can we do? 可是我们还能做什么?
But in the end he gave in. 但最后他还是让步了。
But there’s one thing we are agreed on. 但有一点大家的意见是一致的。
4.用于道歉的表达之后。如：
Sorry, but we’re behind schedule. 抱歉，我们落在计划后了。
I’m frightfully sorry, but I can’t see you today. 太对不起了，我今天不能见你。
Excuse me, but I don’t think that’s quite true. 很抱歉，我认为这与事实略有出入。
5.用于not…but…，表示“不是……而是……”。如：
Not you but I am to blame. 不是你的错而是我的错。
6.用在某些否定词后，表示“只……”。如：
He eats nothing but hamburgers. 他只吃汉堡包。
You have nobody but yourself to blame. 只能怪你自己。
No one but me saw her. 只有我看见她了。
7.用于next(last) but one 中，表示“隔壁再过去”“倒数第……”。如：
He lives in the next house but one. 他住在隔壁再过去一家。
He was the last but one to arrive. 他是倒数第二个到的。
8.can’t help but 不得不…… 如：
You can’t help but respect them. 你不得不尊敬他们。
I can’t help but admire his courage. 我不得不赞赏他的勇气。
注意:不要按汉语意思将“虽然……但是……”直译为although/though…but…：
误：Though we are poor, but we are happy. (去掉though或but)
or的用法:
1.表示选择，意为“或，还是”。如：
Is the radio off or on? 收音机关了还是开着?
Would you prefer tea or coffee? 你喜欢茶还是咖啡？
Is he asleep or awake? 他睡着了还是醒着?
Are you going to America by boat or by air? 你去美国是坐船还是坐飞机？
2.表示一种否定的条件，意为“否则”。如：
Hurry up, or you’ll be late for school. 赶快，否则你上学就要迟到了。
Dress warmly, or else you’ll catch cold. 穿暖和点，否则你会感冒的。
Be careful, or you’ll break that vase!小心，否则你会把那花瓶打碎的!
3.表示“要不就是”。如：
He must be joking, or else he’s mad. 他一定在说笑话，要不就是疯了。
The book must be here, or else you’ve lost it. 这书一定在这儿，要不就是你弄丢了。
4.用于否定句中代替and。如：
He was not clever or good-looking. 他不聪明，长得也不好看。
比较：They sang and danced. 他们既唱歌又跳舞。
They didn’t sing or dance. 他们既没有唱歌也没有跳舞。
5.用于习语。如：
The work is more or less finished. 工作多少做了一点儿。
They consist of 1700 or more tribes. 他们由1700个或更多部族组成。
There’s just one or two details I want to make sure about. 还有一两个细节我想弄清楚。
Either your mother or your father may come with you. 你母亲或是你父亲会陪你去。