一个句子只能有一处谓语动词.tell sb to do sth.是固定短语.那后一句是否可以理解为一个从句：My mother often tells me （that） don't read in bed.不可以，因为从句缺主语如果一定要用从句的话：My mother often tells me （that） I shouldn't read in bed.don't read in bed是一个完整的祈使句啊！祈使句是不能做从句的啊。