It is ________ polite to say"May I come in ?"before you come

it's _______polite to say 'may i come in' before you come in We make it a rule to knock at the door before you come in.I May I come in? You may come ________ today ________ tomorrow -May I ( )(come)in?-Come,please. (填什么?)come before May and it come after March You___ before you come in. it was,i should say ,very kind of you to come all the way to It was ,I should say,very kind of you to come all the way to you may have it in your life to come?这里哪个词组是表示将来. how to say in English .it's easy come on guys. thank you ver 英语翻译1.I am sure it won‘t be too long before you come to unde