帮我看看下面的句子中哪个词有问题?

问题描述:

帮我看看下面的句子中哪个词有问题?
1.What lesson do you have in the morning?
2.Welcome back school ,boys and girls.
3.How many lesson do you have this afternoon?
麻烦说下答案1

1.What lesson do you have in the morning?(what改成which,因为是什么课程)
2.Welcome back (to)school ,boys and girls.(短语welcome to)
3.How many lesson do you have this afternoon?(lesson变复数,因为前面是how many)