Since + 主语 + 过去式，主语 + 现在完成式，

It’s + a shame / nice/ kind + to do (做.....真惭愧/好)

It’s useless/ no good / no use doing sth. (做……是没有用的)

例如：Since he went to senior high school， he has worked very hard.自从他上高中，他一直很用功。

例如：It’s a shame to lose the match. 输了比赛，真惭愧!

It’s nice of you to tell me the truth. 你太好了，告诉我真相。

It’s your turn to look after the young trees. 该你照顾这些小树了。