请问下面这些英语句子错在哪里, 还有，应该怎么改？

Question

1.The reasons of the problems,in my opinions,has three.
2.Because the number of cars was too much.
3.People usually wait in the roads.
4.The number of cars increased slowly.
5.The government need to bulid more roads,

Answer 1

1.has应该改为have，因为主语是复数
2.too much应该改为too many
3.in the road改为on the roads
4.如果上下文都是般时态，increased应该是increases
5.need应该是needs

Answer 2

1.has应该改为have，因为主语是复数
2.too much应该改为too large
3.on the road, in the street
4.如果上下文都是般时态，increased应该是increases
5.need应该是needs

Answer 3

出自短文改错（这是中国特色）吧，这得联系全文，比如时态等，一般来说改错很重要的一点就是凭语感，有很多东西都不是死的，越分析越可能错