The number of people who own cars is increasing (句末加句号后，句子正确，The number是主语)
The number of people who own cars are rich （错误，The number是主语，系动词能够用 are，表语可以用 rich 吗？）
people who own a dog is increasing （错误）
people who own a dog are friendly （错误：people是复数概念，后面可以用 who own a dog吗？）
A lot of people who own a dog are cute（错误，原因同上）
A lot of people who own a dog is increasing（错误，A lot of people是主语，助动词能够用 is吗？）
