1.impress sth on sb 使某人铭记= impress sb with sth
sth impress sb某物给某人留下影响sb be impressed by
impress sth on sb使某人铭记= impress sb with sth
sth is impressed on one’s mind某事被印在脑海里
have/leave/make/ a …impression on sb 给某人留下…的印象
2..react to…对…产生反应react with sth.与某物起（化学）反应
3.动词-ing形式作主语时，为了保持句子平衡，可以用it作形式主语。常用的结构：
1. It is + no use / no good / useless etc.+ v-ing
2. It is + nice / good / interesting / a waste of … etc. + v-ing 例如：
It is no use crying over spilt milk.