（1）直接用在句中作结果状语
例句
a. He lived to be a hundred years old.
b. What have I done to offend you?
c. He lived to see the Second World War.
（2）never to do结构表示结果
例句
a. John left his hometown ten years ago, never to return.
b. We parted never to see each other.
（3）only to do引出意想不到或不愉快的结果 （四、六级考试重点内容）
例句
a. We hurried to the railway station, only to find the train had just left.
我们匆匆忙忙赶到火车站，结果却发现火车刚刚离站。
b. All too often, women complain that they’re educated as equals, only to go out into the workforce to be treated as inferiors.
女性常常抱怨说，她们和男性接受同样的教育，结果在职场上却被认为低人一等。
c. He worked very hard,______he had not finished half of the job.
A.to find
B.finding
C.just finding
D.only to find
正确答案：D。
（4）…enough to
a. He is not old enough to go to school.
他还没有到上学的年龄。
b. The teacher speaks loudly enough to make himself heard clearly.
（5）too…to结构
这一结构我们常熟悉的意思是“太……以致不能……”，肯定形式表达否定意思。
a. The box is too heavy for me to move.
这箱子太沉了，我挪动不了。
b. The tea is too hot to drink .
c. An Interesting Maid　有趣的女仆
Mistress: Be careful not to drop those china dishes.
Maid: Don’t worry, madam. They are too light to hurt my feet.
女主人：小心别把那些瓷盘子打碎了。
女仆：别担心，夫人。它们不会砸伤我的脚，因为它们很轻。