業精於勤，事立於豫

151. invite sb to do sth　　邀請某人做某事

152. It takes sb sometime to do sth　　做某事花費某人多少時間

例句：It took me 5 minutes to do my homework. (做作業花了我5分鐘的時間。)

153. It's + adj + for sb to do sth　　做某事對某人來說怎麽樣

154. It's + adj +to do　　做某事怎麽樣 

155. It's + adj + of sb to do sth　　做某事說明某人怎麽樣

例句：It's nice of you to help me with my English. (幫助我學習英語，你真是太好了。)

156. It's time to do sth = It's time for sth　　到該做某事的時間了

例句：It's time to have class. (該去上課了。)
　　＝It's time for class. 

157. join in = take part in　　參加

158. just now　　剛才

159. keep + sb/sth + adj./介詞短語　　讓……保持…

例句：I want to keep my mother happy. (我想讓我媽媽保持快樂。)

160. key to + 名詞　　某物的鑰匙或某題的答案