in bed 和in the bed有什么区别?

in bed和in the bed有什么区别? in bed 和on the bed有什么区别? 短语ni bed 和 in the bed 有什么区别 on bed ,on the bed,in bed ,in the bed有什么区别 in bed /on bed /in the bed /on the bed之间有什么区别?快 in bed和 in the bed有什么区别?in class和 in the class有什么区别? in the bed 和in bed 有什么区别吗?(so do in the hospital and in hosp be in bed 和be in the bed的区别~ stay in bed 和stay in the bed的区别 in bed ,in the bed 有何区别? in the bed 与 in bed 的区别 in the bed 与 in bed 的区别!要详细说明加the有什么 in bed ,in the bed 的区别