英语翻译

题目

英语翻译
When you visit someone,it's the custom to bring a small gift.
you aren't supposed to arrive early.
If you want to bring someone,you're expected to call first and ask.
you're supposed to check with the host.
it's not acceptable to arrive without
calling first.
翻译下这几个句子,再告诉我句中的：is the custom to
aren't supposed to are expected to are supposed to
is not acceptable to

答案

当你拜访别人是,通常要带点小礼物,你不要太早到.如果你想带某人一起去,你应该先打个电话问下.你应该跟主人确认下,事先没打电话就直接去不太好.
is the custom to 是习惯,惯例
aren't supposed to 不应该
are expected to 被期待,应该做
are supposed to 应该
is not acceptable to is 不可接受的.