英语改错题,画线部分哪里错了?Can you tell me how many students are there i

英语改错题,画线部分哪里错了?
Can you tell me how many students are there in your class? （画线：tell,how many,are there)
Edison's father asked him why he wanted a science lab for. (画线：asked,why,wanted)
He said that they are going to the small village again. (画线：said,are,to)