HowamIsupposetoknow?

How am I suppose to know?还是How am I supposed to know? suppose和supposed区别？

be supposed to （do）：应该；被期望；理应。 固定用法

How am I supposed to know? suppose 动词原形 supposed 动词的过去分词 be supposed to 固定组合

suppose表示认为时用一般现在时。"oh, well," i said."i suppose you like to add them up." “哦，好吗，”我说。“依我看你是多多益善吧。 表示假设时用虚拟语气。suppose it rained, we would still go. 假如下雨的话，我们还是要去。