能否帮忙订正以下6句话：并用虚拟语句:)1.It ′s ordered that we must have classes during the
holiday 2.It is necessary that students should learn more scientific culture.学生期间,多学习科学文化是必要的 3.It′s high time that I kept words in mind.4.I would rather he didn′t tell me this thing.5.If only it should rain tomorrow.6.If there was no sunshine,otherwise,all organisms on the earth would die.（如果没有阳光,地球上所有生物都会死）