同学你好，该知识点来自沪江网校《初级起点直达PETS三级【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好~

同学需要注意下，to do结构不仅可以做状语和补语，还有做定语的功能。
这里to realize更应该被理解为修饰time的定语，即“没有意识到XX的时间”；

to do做状语的情况一般是：
(1) 目的状语
强调目的性时，还可以写成in order to do或so as to do
Her mother plans to fly to Beijing four times a year (so as / in order) to visit her. 她母亲计划每年飞四次北京来看她。
Bob took down my phone number so as / in order not to forget it. 鲍勃写下了我的电话号码以免忘记。
(2) 结果状语
用于下列句式：so...as to / such...as to / ...enough to / only to（表示意外或事与愿违）/ too...to
I'm not so stupid as to write it down. 我不至于蠢到把它写下来。
Jane hurried to the station only to find that the train had left. 简匆忙赶到车站却发现火车已经开走了。
I'm too tired to stay up longer. 我太累了不能再熬夜了。
【注意】在only too...to中，too...to...是“非常、特别”的意思，常与pleased / ready / willing / glad / happy搭配。
I'm only too glad to have passed the exam. 考试及格了我非常高兴。
(3) 原因状语
与情感形容词搭配，说明产生这种情绪的原因。常见的此类形容词有happy / glad / sorry / anxious / proud / disappointed / angry / surprised / ready / delighted等。
You will never know how happy I was to see her yesterday.

to do做补语一般是搭配以下动词：

You are not allowed to smoke here. 此处不允许吸烟。
The doctor warned him not to eat too much meat. 医生告诫他不要吃太多的肉。
☀think / consider / believe / suppose / feel / find / imagine / prove / appoint / judge / leave等后常接to be作宾补（被动态就成了主补）。
Most people considered him to be a great leader. 大多数人认为他是个伟大的领袖。
They found the answer to be satisfatory. 他们觉得那个回答令人满意。
The Chinese food is considered to be the most delicious in the world. 中餐被认为是全世界最美味的。
The flu is believed to be a new type of flu. 这种流感被认定为新型流感。
We hurriedly ended the meeting, leaving many problems to be settled. 我们匆忙结束了会议，留下很多问题待解决。
☀ leave / set sb. to do让某人去做某事，和使役动词表达的意思一样
He left Jim to find his own way home. 他让吉姆自己回家去。
He set the students to write down what he said. 他让学生们把他的话记下来。

希望帮到同学~