Bill didn't go to school yesterday morning,----昨天上午,bill没去上学.因为为过去的时间,所以使用didn't进行否定
because he felt terrible,so his mother took him to see a doctor.And the doctor said Bill had caught a bad cold,and he must take a good rest and drink more water.So Bill had to take the doctor's advise to take some medicine and stay at home yesterday to take a good rest.
希望能够帮到你,有问题可以继续提问