这个英语动名词是做什么成分?

题目

这个英语动名词是做什么成分?
If you are a salesman ,making door-to-door sales,how would you promote your products and persuade your customes to buy?
1.这句话对不?改为If you are a salesman ,making door-to-door sales.How would you promote your products and persuade your customes to buy?
2.那个making door-to-door sales是做什么成分,是后置定语,还是省略了主语的什么.

答案

改后的不对.
If引导条件状语从句,和后面的how would you promote your products and persuade your customes to buy?共同构成一个句子
making door-to-door sales是现在分词作定语,修饰前面的salesman