be supposed to的用法问题RT was supposed to 和 were supposed to 的情况但感觉它和should差不多,should一般不出现过去式.所以be supposed to一般只用 is/are supposed to

问题描述:

be supposed to的用法问题
RT was supposed to 和 were supposed to 的情况
但感觉它和should差不多,should一般不出现过去式.所以be supposed to一般只用 is/are supposed to