2after“…时间后”结构：after+时间段，常用于一般过去时，和1相同。
They went to Beijing after five days. The dog died after a week.
(after也可加句子, 但主句不一定用一般过去时：I’ll send you an e-mail after I get home.
Return it to me after you finish it. 见2.)
3ago“…时间前”结构：时间段+ago, 用于一般过去时。
The Greens moved to Shanghai four weeks ago. I saw it ten minutes ago.
(若有since+时间段+ago，常用现在完成时：Mr. Li has worked here since 5 years ago.)
4before 单独放在句尾，常用现在完成时：“以前”
I have been to London before. He has seen the film before.
(若是时间段+before,常用过去完成时，“…前”： I had seen the film two weeks before. We had found out the answer to the problem an hour before.)
19.四季：spring春;summer夏;autumn秋;winter冬;season季
20.月：January, 一月; February, 二月; March, 三月; April, 四月; May, 五月;
June, 六月; July, 七月; August, 八月; September, 九月; October, 十月;
November, 十一月; December, 十二月。
21.星期：Sunday, 周日;Monday, 周一;Tuesday, 周二;Wednesday, 周三;Thursday, 周四;Friday, 周五;Saturday, 周六。Sunday是一周的第一天， Saturday是最后一天。
22.“也”：either, 用于否定句的末尾。also, 通常挨着动词，少用于句尾。too, 通常在句尾，前常有逗号。as well, 只用于句尾, 前无逗号。 注意：后三个词都不用于否定句。
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