1.be interested in 在作定语时,BE可以省略.
如:the boy interested in football is my brother.(那个对足球感兴趣的男孩是我哥哥)
此时BE就可以省略.
而be sure of 作定语时只能用做being sure of 表主动.如:the man being sure of her safety is really very brave.(那个保证她安全的男子很勇敢}
2.bow to sb.是向某人鞠躬的意思.
3.再次做某事时不可仪那样说.可以说 do it once again或do it for a second time.