请大家帮我纠正着几个句子的语法错误

请大家帮我纠正着几个句子的语法错误
1.We all like the teachers which class is interesting and creative.
2.Which could come to help me?
3.How high is your sister?
4.How old is your T-shirt?
5.How much are these oranges?
6.The much regularly we eat,the healthier we are
7.Tomorrow is beautiful.
8.Look at the coulds ,it will rain
9.Our teacher told us that shanghai was bigger than beijin.
10.As soon as I will arrive in Boston,I will call you
注:以上句子只有一处错误。