38. see/hear sb. do/doing sth. 看见/听到某人做了某事/在做某事
做饭时，我听到有人在敲门。
I heard someone knocking at/on the door when I was cooking.
突然我看到他从自行车上摔了下来。
Suddenly, I saw him fall off the bicycle.
39. too＋adj./adv.＋to do sth. 太……以至于不……
这间教室太小了，容不下40名学生。
This classroom is too small to hold forty students.
Sandy太小了，还不能独自去上学。
Sandy is too young to go to school by himself.
今天风太大了，划不了船。
It's too windy to go boating today.
40. so＋adj./adv.＋that从句 太……以至于……
这个电影太有趣了，我还想再看一遍。
This film is so interesting that I want to watch/see it again.
这道题太难了，我和Sue都算不出来。
This problem was so difficult that neither Sue nor I could work it out.
姚明篮球打得非常好，世界上很多人都知道他。
Yao Ming plays basketball so well that many people in/around the world know him.
41. such a/an＋adj.＋n.(可数)＋that从句 某事物太……以至于……
这部电影太有趣了，我还想再看一遍。
It's such an interesting film that I want to see/watch it again.
这部侦探小说真有意思，他看得都忘记吃晚饭了。
It was such an interesting detective novel that he forgot to have dinner.
铃声一响，学生们就不互相说话了。
Students stopped talking with each other as soon as the bell rang.