You need’t be so rude about it.这句话里为什么要加be呢?

You need’t be so rude about it.这句话里为什么要加be呢? You needn't be so rude about it.这句话中about是什么意思 you needn't be so rude about it? you need not be so rude about it 这里about it做主补?还是什么别的成分 "you needn t be so rude about it ",my wife answered as she l It must be terrible to be grown up!这句话里为什么要加be呢? be rude about it还是be rude to it you shouldn't be so rude to others,you should be f_____ .括号内 why are you always so rude to your parents?can't you be __ t It never ___to her that such a gentleman should be so rude t You can't imagine a well-behaved gentleman ______ be so rude you are not be alone 为什么要加be呢?