关于英语短语的一些用法问题

关于英语短语的一些用法问题
我想知道以下的用法的意思和2者用法之间的不同（比如说人称,时态等）需要注意的事项有哪些,非常急,想知道 1.It is + adj+for sb to do It is +adj +of sb to do 2.It takes sb+some time +to do sth It takes time for sb to do sth 3.It is+adj+ -ving （动词的ING） 用法和意思 4.It is no use (good) +doing sth 5.It is worthwhile doing sth 6.I have no choice but to do sth I have nothing to do but do sth 第6里面的句子在什么时候TO可以省略 7.have sth to do have sth to be done 8.have sb do sth have sb done have sb doing sth have sb sth done

1.前者是指对于某人来说,做什么事,怎么样; 后者是对某人做某事情的评价 eg.It is difficult for you to dance like MJ.像迈克杰克逊那样跳舞很难.It is kind of you to help me.你帮助了我,真是好心啊.2.前者是指做某事花了某人多少时间；后者是指对某人来说做某事是浪费时间 eg.It takes me an hour to finish my homework.我花了一个小时来完成家庭作业.It takes time for you to pay more attention on your clothes.你浪费了更多的时间在你的衣服上.3.做某事怎么样,强调正在做某事,或是正处于某种状态 eg.It is difficult doing it.我现在正在做的这件事很难.It is interesting playing with children.和孩子们玩很有趣.4.做某事没用（不好） eg.It is no use giving him money.你光施舍他是没用的.It is no good telling lies.说谎是不好的.5.worthwhile a.值得花时间的,值得做的,有真实价值的 it is worthwhile doing sth 做某事划算 eg.It is worthwhile seeing the film.这电影值得一看.I think it worthwhile reading that book.我认为那本书值得一读.6.这两个是固定搭配,哪个都不能省略,不过两者意思都差不多,指除了某事,别无选择,不过前者有点无可奈何的味道,而后者除了指不情愿做的事情以外,也可以指主动愿意做的事.eg.I have no choice but to leave.I have nothing to to but leave.我除了离开,别无选择.I have nothing to do but sread.我除了看书就没其他事情了.7.首先指出,是 have sth done 不是 have sth to be done 两个都是指做某事,但前者是自己做,后者是自己让别人来帮自己做 eg.I have work to finish.我要自己完成工作.I have my hair cut.我让别人给我剪头发.8.(1)have sth./ sb.do 省略to 的不定式 (do)作宾补,与 sth./ sb.之间具有逻辑上的主谓关系,即“让某人做某事”,不定式往往表示一次性的具体动作,且强调动作已经完成或尚未发生.如：The soldiers had the boy stand with his back to his father.士兵让这男孩背对父亲站着.Have the driver bring the car round at 4 o’clock.请让司机四点钟把车开过来.(2)have sth./ sb.doing 现在分词(doing)作宾补,与 sth./ sb.形成逻辑上的主谓关系,而且这种动作往往具有持续、进行的含义.如：The two men had their lights burning all night long.那两个人让灯通宵亮着.They tried to have her talking.But no use.他们想让她说话,但没用.另外,还可用句型 Won't/ can't + have + sb.+ doing sth.,表示不允许或禁止.如：I can't have them wasting their time in this way.我不允许他们这样浪费时间.I can't have you catching cold.Run and change your wet clothes.我不能让你着凉.快去把湿衣服换掉.