一、聯合關系

常用的連詞有and(同，和), when(=and just at this time就在這時，然后), not only…but (also)…(不僅……而且……), neither…nor…(既不……也不……)等。如：

He helps me and I help him.他幫我，我幫他。

He not only gave us a lot of advice, but also helped us to study English. 他不僅給我們出很多建議并且還幫助我學英語。

I was just leaving when the telephone rang. 我正要離開，電話鈴響了。

注：when作這種用法時，主要用于was/were doing sth. when sth./sb. did; was/were about to do sth. when sth./sb. did; was/were on the point of doing sth. when sth./sb. did等句型中，表示“當某人或某物正在或正要做某事，就在這時突然又發生了另一事”。

二、選擇關系

常用的連詞有or(或者，否則), otherwise(否則), or else(否則), either...or(不是……就是)。如：

Hurry up, or (else) you’ll be late. 快點，否則就會遲到了。

Will he still be there or will he have gone away? 你那時還在那里還是可能已經走了?

You must go early, otherwise you will miss the bus. 你好得早點走，否則就趕不上公共汽車了。

Either Tom is coming or his sisters are. 不是湯姆就是她的姐妹們要來。

三、轉折關系

常用的連詞有but(但是，可是，只是因為), while(而、卻), yet(可是)等。如：

It never rains but it pours. 禍不單行。

I like tea while she likes coffee. 我喜歡喝茶而她喜歡喝咖啡。

She said she would be late, yet she arrived on time. 她說她會遲到，但她卻準時到達了。

She looks very young, but she is already in her 30’s. 她看上去很年輕,可是她已三十多歲了。

此處，還有副still(仍然)，however(然而)也表示轉折關系。

He is good-natured; still I don’t like him. 他脾氣很好,可是我還是不喜歡他。

The book is expensive; however, it’s worth it. 這本書很貴;卻很值。

注意：but, while不與although連用，但yet, still可與although連用。

Although she felt ill, she still went to work. 她雖然感覺不舒服，但她仍然去上班。

四、因果關系

常用的連詞有for(因為)和so(所以，因此)等。如：

I am thirsty, for it is hot. 我口渴，因為天氣太熱。

The manager was ill so I went in her place. 經理病了所以我代她去。

注意：so不與because連用。