however 然而，但是

So teaching gives me pace, and variety, and challenge, and the opportunity to keep on learning.I have left out, however, the most important reasons why I teach.所说，教学使我的工作进程有了规律，使我的生活变得丰富多采，教学向我提出挑战，也给了我不断学习的机会。不过，我要教书的最重要的几个原因还没有讲到呢。

in case 万 一

I shall stay in the hotel all day in case Mary comes.我要整天呆在旅馆，以防玛丽要来。

Take more clothes in case the weather is cold.多带点衣服以防天气冷。

In case she arrives before I come bake, ask her to wait for me. 万一在我回来之前她来了，让她等我。

In case I forget it, please remind me about it.万一我忘了， 请提醒我。

lest 唯恐(从句中谓语多由 should 构成，有时用动词原形)

She began to be worried lest he should have met with some accident.她开始不安起来，唯恐他发生什么事。

He was watching me or something for an hour or two, drawing back the curtain so little lest I catch him, but I saw his face, and I think I can see now the anxiety upon it, the worried impatience. 我看见他正从窗口朝外张望。有一两个钟头，他大概一直在留神我的动静；他只把窗帘掀开一点儿，生怕我发现他，但我还是看到了他的脸。我觉得现在我还能看到他脸上的忧虑神情，那种担心而且焦急的神情。

neither⋯nor 即不⋯⋯也不(可连接两个主语、宾语、表语、谓语和状语) But neither the nursery nor the motel my parents bought later had provided enough income to send my sister and me to college. 然而，无论是托儿所还是我父母后来购买的汽车旅馆都不能提供足够的收入供我妹妹和我上大学。

I have neither property nor money.我即没有什么家当也没有钱。There will be neither rest nor tranquility in America umtil the Negro is granted his citizenship rights.直到黑人被赋予公民权美国才会有歇息和安。

She neither ate nor drank.她不吃也不喝。

Tom just came at the right time, neither too early nor too late. 汤姆来得正是时候，不早也不晚。

nevertheless 然而；尽管如此，仍就

Nevertheless, perhaps people should not be spending so much of

their time in front of the TV.然而，或许人们不应花那么多的时间看电视。

There wasn't any news, nevertheless, she went on hoping.尽管没有任何消息，但她仍抱有希望。

no matter 不管怎样(后接疑问词)

For me, teaching is a red-eye, sweaty-palm, sinking-stomach profession.Red-eye, because I never feel ready to teach no natter how late I stay up preparing.对我来说，教书是个会令人熬红眼睛、手掌出汗、精神沮丧的职业。说熬红眼睛，这是因为我眼上无论备课备到多晚，总觉得备得还不充分。

I go out a lot because of my teeth.You know how it is：you pick up something in a restaurant and your teeth turn rotten, no matter how careful you are.我因牙齿坏了，经常出去。你知道这是怎么回事：只要你在饭馆里拣东西吃，牙齿就会被搞坏，你再当心都没有用。

no soonet⋯than 一⋯⋯就(以 No sonner 开头的句子要倒装)

The sun had no sooner started to shine than it was clouded over again.太阳一出来就被云遮上了。

No sooner had he gone to bed than the telephone rang once more. 他还没到床上电话又响起来了。

not only⋯but(also) 不但⋯⋯而且

We will not only bring joy into other people's lives, but also, very often, add happiness into our own.我们不仅要给别人的生活带来欢乐，而且经常给我们自己的生活增添幸福。