请求解释一个用词You should be called upon at any time because accide

请求解释一个用词You should be called upon at any time because accide we should be polite to the elderly at any time.怎样改为祈使句 You should be able to work at least half an hour at a time w We should learn how to p( ) ourselves at any time. You should be more careful next time. You should be on time tomorrow. 麻烦翻译以下jack should be here at any moment.. you should be home = you should at home You are called any name what may be done at any time will be done at no time what may be done at any time will be done at no time. What may be done at any time will be done at no time这句话是什么意思