連詞有：in order that, so that, in case, for fear that

　�、賗n order that"為了;以便"。多用于正式文體，通�？梢耘cso that換用。如：

　　You stopped at Hangzhou _____________ they could go around the West Lake.

　　他們在杭州停了下來，以便游覽西湖。

　　The expert spoke slowly _________________________________________________.

　　專家講得很慢，以便人人聽得懂。

　　注意：in order to與so as to 也表示"為了，以便于"，但是后面只能接單詞或短語，不能接句子，且so as to一般位于主句后，可與so that/ in order that進(jìn)行同義句轉(zhuǎn)換

　　He studies hard _____________ he can get good marks.

　　= _______________________________________________________________.

　　She gets up early ______________ get there on time.

　　= ______________________________________________________________.

　　= ______________________________________________________________.

　�、趇n case意思是"以免","以防",多用于英國英語，它所引導(dǎo)的從句中的謂語動(dòng)詞可以是陳述語氣形式，也可以是虛擬語氣形式;

　　Take your umbrella in case it rains.

　　帶上你的傘，以防下雨。

　　He took an umbrella with him for fear that it might rain.

　　他帶了一把傘，以防下雨。