you can never be ------- careful when cross the street A les

you can never be ------- careful when cross the street A les 连词成句：cross,be,the,when,careful,you,street Be careful when you cross the street.为什么用cross而不用across? you must be careful when you cross the street中可以用if替代when吗 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 . 用cross,be,the,when,careful,you,street连词成句 Be careful when you cross the street改成用非谓语动词