为什么I don't know if is polite to speak loudly at the table中if

为什么I don't know if is polite to speak loudly at the table中if I don't know whether to take the medicine at once.If I _____ Don't taik loudly at the meeting.If you do,you will have to Don't talk loudly at the meeting .If you __ ,you have to go –Is it polite to speak or laugh loudly _________? –No, I don but I don't know if there is a table ( )us four there.括号中应该填 I should like to try the coat on, for I don’t know if it is IF YOU DON‘T KNOW HOW TO SPEAK IN ENGLISN； I don't know if this is the right___to say sorry to him 英语翻译If you don't know.please don't speak to me.Don't talk to I don't know if he __ to the movie this evening.If he wants, 选择,Could you tell me -it is polite to speak -at the table?