「午前」的英文缩写是 am，还是 a. m. ？ - 知乎 am pm 用的时候一定要紧跟时间，不能机械地去替代morning和afternoon。比如你可以说 7am，大家都知道是上午7点；同时相信你绝对不会说出'Good am '这样的话 。
punctuation - AM PM vs a. m. p. m. vs am pm - English Language Usage . . . I used to think PM AM was correct, but at some point, I switched to using p m a m for reasons I can't recall I know that in practical, casual writing, people tend to use whatever form is most convenient to them, but I'm curious about what the official usage—should it exist—actually is
12 小时制中，pm am 什么时候该用大写，什么时候用小写？ 鲜见大小写混合的一般文本中出现大写或小型大写的 A M 、AM。当然，如果是一个大写的环境中，比如大写的标题、标语、标识或蛋疼的大段大写文本，当然一般也会让 a m am 大写为 A M AM。
grammaticality - It is I who is or It is I who am? - English . . . Getting relative pronouns like "who" to agree with verbs can seem tricky But it's actually quite easy The pronoun "who" takes the same number and person as its antecedent, in this case "I " So "It is I who am" is correct in this case