“get＋宾语＋to do”句型意为“使……去做某事”,其中get为使役动词,不定式作宾语补足语,且to不可少；能用于该结构的使役动词还有make,let,have,但此时作宾补不定式中的to应省略.例如：
You must get them to come over here．你得想法让他们到这儿来.
Let them go away．让他们走开.
find sb doing sth意思是发现某人正在做某事.
主句的谓语动词为感官动词see,hear,watch或find等时,宾语从句常简化成“感官动词find＋宾语＋宾语补足语”结构,此时宾语由从句的主语转化而来,而宾语补足语多为不带to的不定式或V-ing形式.如：
I found that some children were playing in the park.→I found some children playing in the park.