如何对be doing sth when造句

如何对be doing sth when造句 be doing sth.when be on the point of doing sth.when...be on the point of doing sth.when...是固定句型, be successful in (doing) sth.be successful at (doing) sth.如何翻译,有什么区别 be always doing sth . be doing sth. 用 Sb who do sth be like sb else doing sth else who,when/once.造句 be happy （about）doing sth .be happy to do sth.哪个对? be worried doing sth 还是be worried about doing sth when+doing 还是when+to do sth. be worthy of sth / doing sth. be worth sth./doing sth.造句, there be sb/sth doing be afraid of doing sth be busy doing sth 例句 be interested in doing sth be busy in doing sth be long in doing sth