|
二十二、Since + S + 过去式，S + 现在完成式。 例句：Since he went to senior high school, he has worked very hard. 自从他上高中，他一直很用功。 二十三、It pays to + V ~~~ 例句：It pays to help others. 帮助别人是值得的。 二十四、be based on 例句：The progress of thee society is based on harmony. 社会的进步是以和谐为基础的。 | 
