U53-后面跟doing的动词 Verb+doing
U54-后面跟to do的动词 Verb+to do
U55-后面跟宾语再+to do的动词 Verb+sb+to do
U56-动词后面加doing VS to do对比(一) Verb to do or doing (I)
U57ーtry, regret, help 后的doing 和 to do 对比
U58-like to do VS like doing
U61-be/get used to doing 习惯
U65-adj for/of sb to do sth