Be careful when you cross the street改成用非谓语动词

Be careful when you cross the street改成用非谓语动词 用非谓语动词改写这个句子be careful when you cross the street Be careful when you cross the street.为什么用cross而不用across? 连词成句：cross,be,the,when,careful,you,street you must be careful when you cross the street中可以用if替代when吗 用cross,be,the,when,careful,you,street连词成句 You should BE careful when you cross the street in the big c You must be careful when you cross the street.改为祈使句 be careful when you cross the street,or you may __run over b you must be careful when you cross the street.(同义句) You'd better be careful when you walk ( )[cross] the street. Be careful when you cross this very busy street .