3、when 句型：

　　(1) be doing sth ---- when ---

　　例：He was still smiling when the door opened and his wife came in.

　　他正笑着的时候门突然开了，他妻子走了进来。

　　(2) be about to do sth --- when ---

　　例：We were about to start when it began to rain.

　　我们刚要出发，天就开始下雨了。

　　(3) had not done sth --- when ---/ hardly --- when ---

　　例： He had not fallen asleep when the telephone rang.

　　他刚要入睡电话就响了。

　　(4) had just done ---- when ---

　　例：I had just gone to bed after a very hard day when the phone rang.

　　在劳累了一天之后我刚刚就寝，电话铃就响了。

　　4、seem 句型：

　　(1) It +seems + that从句

　　例：It seemed that everyone was satisfied. 看来好像每个人都很满意。

　　(2) It seems to sb that ---

　　例：It seems to me that she is right. 我看她是对的，

　　(3) There seems to be ----

　　例：There seems to be a heavy rain. 看上去要有一场大雨。

　　(4) It seems as if ----

　　例：It seemed that she couldn't come to class.看样子她不能来上课了。

　　5、表示“相差……;增加了……;增加到……”句型：

　　(1) She is taller than I by three inches. 她比我高三英寸

　　(2) There is one year between us. 我们之间相差一岁。

　　(3) She is three years old than I 她比我大三岁。

　　(4) They have increased the price by 50%. 他们把价格上涨了50%