may i come in对吗.为什么又有shall he come in .两者之间有很不同?

may i come in对吗.为什么又有shall he come in .两者之间有很不同? May/Can/Am/Shall I come in? May I come in? 有没有语法错误hello tom hi sam may I come in come in please have yo -May I ( )(come)in?-Come,please. can i come in对吗 May I come in?怎样变成祈使句 May I come in?的肯定答语 may i come in,miss gao?中文 may i come in 的另一种说法 英语中may I COME IN?回答 may i come in 的肯定回答