Can you come to my party?

Q1:can, could（能）表示一般现在时和一般过去时两种时态，有时也能表示将来时。所有其他时态（包括将来时）须用to be able 加动词不定式来表示。①What can I do for you?我能为你做什么吗？②It surely cant be eleven oclock already. 不可能已经十一点钟了。③We were sure that he could pass the test.我们肯定他能通过测试。④Will you be able to finish the chemical experiment today? 你今天能做完这个化学实验吗？⑤The seventy-year-old man has been able to swim in the ocean in winter for twenty years.这位七十岁的老人冬天能在海里游泳已经有二十年的历史了。

Q2:must必须，应当①You must get to the airport before nine oclock. 你必须在九点以前到达飞机场。②Your homework must be clear and complete.你的作业应当清楚完整。③He must be in the reading room now.他现在准是在阅览室。（表示说话人对事物的推测）④She must be writing a letter to her mother.她现在一定在给她妈妈写信。（must加动词不定式进行时也可表示对现在发生的动作的推测，表示一定或准是的意思。）⑤The road is wet. It must have rained last night.马路湿了，昨晚一定下雨了。（must加动词不定式的完成式，说明对过去事物的推测，表示一定或准是的意思。）●两种否定式的比较must not表示不应该、不许可，语气比较强烈。如：We mustnt waste our time.我们不应该浪费我们的时间。need not（不必）表示must在意义上的否定。如：Must we clean our classroom today?----No, you neednt.我们必须今天清扫教室吗？不，不必。

Q3:have to（不得不，必须）①To launch satellites into space, we have to use big powerful rockets.要把卫星射入太空我们必须得使用巨型强力火箭。②There is no bus to the village and we have to walk there.没有到那个村子的公共汽车，我们必须步行去那里。5、need需要用于疑问句及否定句，单数第三人称不加-s，后接动词原形。（在肯定句里既可用做情态动词又可用做实义动词。当用做实义动词时，单数第三人称加-s，并有时态变化。）①Need we go to the factory on foot?我们今天需要步行去工厂吗？②You neednt do your homework in class. You may do it after class. 你不必在课堂上做作业，你可以课后做。●neednt后加动词的完成式时，指过去已做了但不需做的动作。③You neednt have bought the new watch, as the old one could be repaired.你本可以不必买只新表，因为旧表能修好。④You neednt have brought your umbrella． It is going to be clear up.你本可以不必带伞，天就要晴了。●didnt have to和didnt need to表示过去未做也不需做的动作。如：⑤I didnt have to help her with her mathematics, for she is good at math.我没有必要帮她数学，她擅长数学。⑥She knew the way to the library, so you didnt need to show her the way.她知道去图书馆的路，所以你没有必要给她指路。

Q4:—Mum,I go out to play?—Yes, you can. But you must finish your homework first.

Q5:—you use microblog(微博) to post messages?—Sorry, I.

Q6:There’s only one day left(剩下). Youfinish your school work by tomorrow(明天以前).

Q7:When winter comes,spring be far behind?(冬天来了，春天还会远吗？)

Q8:—I swim here?—I’m sorry. Childrenswim alone(单独地) here.