1. 145 300 610 1230 In the above sequence every term after the first is formed by multiplying by x and then adding y, where x and y are positive integers. What is the value of x + y? 2. A confectioner has 500 mint, 500 orange and 500 strawberry flavored sweets. He wishes to make packets containing 10 mint, 5 orange and 5 strawberry sweets. What is the maximum number of packets of this type he can make? 3. If S is the sum of 8,6,4,2 and x, what must be the value of x for x to equal 1/5 S ? 4. 25 per cent of 600 is equal to 15 per cent of what number? 5. What is the maximum number of points of intersection of four distinct lines in a plane? 6. If one edge of a 6-inch ruler is to be marked in 1/10 inch units, how many marks will there be on the edge including the 0 and 6 inch marks? 7. Given that the sum of the odd integers from 1 to 99 inclusive is 2500, what is the sum of the even integers from 2 to 100 inclusive? 以上就是这7道SAT数学运算题练习题的全部内容，包括代数和几何两个部分的内容。大家在备考SAT数学运算题的时候，可以练习一下这些题目，以便更好的了解SAT数学运算题的解题过程和解题方法。

过去时表示过去某个时间发生的动作或存在的状态，也可表示过去经常或反复发生的动作。常和yesterday, ago, last week等表示过去

中实体最重要的学会总结，本文整理一些值得一做的英语一般过去时经典习题，希望大家能在做过这些题目后，能过学着总结，希望大家有所收获，最后大家学业顺利。

行时的练习题 1. What _____ your grandfather _____ this time yesterday? A. is ... doing B. was ... doing C. did .. do D. had ... done 2. ____ you ______ a meeting at four yesterday afternoon? A. Were ... having B. Was ... having C. Did ... have D. Do ... have  3. A: I called you at about half past eight last night , but nobody answered.    B: Oh , I ______ in my office at that time. A. will work B. was working C. worked D. had worked  4. His family _____ TV from ten to twelve last night. A. watched B. were watching C. had watched D. was watching  5. Li Lei ______ a letter to his friend last night. A. was writing B. was written C. will write D. writes  6. A: Hi , Lin Tao . I didn’t see you at the party.     B: Oh, I ________ ready for the maths exam. A. am getting B. was getting C. got D. have got  7. A: I called you yesterday evening ,but there was no answer. B: Oh ,I am sorry I dinner at my friend’s home. A．have B．had C．was having D．have had  参考答案： 1.B. this time yesterday表示“昨天的这时”，属过去的一点时间，所以选B. 2. A. at four yesterday afternoon表示过去的一点时间 3. B. at that time表示过去的一点时间 4. B. from ten to twelve last night表示过去的一段时间 5. A. last night与过去进行时连用，说明动作还没有结束 。B,C,D时态、语态不合题意,所以，选A 6. B. 上下文联系，过去正在进行。非延续性的动词用进行时表示状态。 7. C. 上下文联系，过去正在进行。 好了，以上就是｜过去进行时测试选择题｜的练习题，大家都对了几道呢？这部分的练习题是初学语法同学的一个难点，这类题比翻译题的难度稍微简单，在做题时同学们不要投机取巧。若是有做错的题不妨把错题多看几遍，结合笔记再巩固下，最后希望大家英语考试顺利！

想要做好阅读理解这个题型，平时的阅读积累很重要，而在四级阅读考试中，速度也是顺利通过的非常关键的一个因素。今天我们为大家整理了英语四级阅读冲刺经典练习题，希望能对大家有所帮助。 英语四级阅读冲刺经典练习题：(1) As soon as it was revealed that a reporter for Progressive magazine had discovered how to make a hydrogen bomb, a group of firearm (火器) fans formed the National Hydrogen Bomb Association

[en]There are two [w=tense]tenses[/w] in English – past and present.[/en][cn]英语里有两种时态—过去时和现在时。[/cn] [en]The past tense in English is used:[/en][cn]英语里过去时用于：[/cn] [en]to talk about the past[/en][cn]谈论过去[/cn] [en]to talk about [w=hypothese]hypotheses[/w] – things that are imagined rather than true.[/en][cn]谈论假设[/cn] [en]for politeness.[/en][cn]基于礼貌[/cn] There are four past tense forms in English: We use these forms: to talk about the past: He worked at McDonald’s. He had worked there since July. He was working at McDonald’s. He had been working since July. to refer to the present or future in [w=condition]conditions[/w]: He could get a new job if he really tried. If Jack was playing they would probably win. and hypotheses: It might be dangerous. Suppose they got lost. I would always help someone who really needed help. and wishes: I wish it wasn’t so cold. [en]In conditions, hypotheses and wishes, if we want to talk about the past, we always use the past perfect:[/en][cn]在条件状语从句、虚拟语气以及表祝愿时，我们在谈论过去时，经常使用过去完成时。[/cn] I would have helped him if he had asked. It was very dangerous, What if you had got lost? I wish I hadn’t spent so much money last month. [en]We can use the past forms to talk about the present in a few polite expressions:[/en][cn]在一些礼貌的表达中，我们用过去式来谈论现在的事情。[/cn] Excuse me, I was wondering if this was the train for York. I just hoped you would be able to help me.

过去时的概念 一般过去时表示过去某个时间发生的动作或存在的状态。常和表示过去

见过面。 By the end of the year no decision had been made. 到年底也没有做出任何决定。 He had left when I arrived. 当我到达时他已经离开。 英语过去将来时的用法： 1. was / were going to + 动词原形：该结构有两个主要用法，一是表示过去的打算，二是表示在过去看来有迹象表明将要发生某事。如： I thought it was going to rain. 我想要下雨了。 I was going to leave when he came in. 他进来时我正要离开。 2. was / were to + 动词原形：主要表示过去按计划或安排要做的事情。如： He asked where he was to put it. 他问他该把它放在哪里。 She said she was to get married next month. 她说她计划在下个月结婚。 3. was / were about to + 动词原形：表示在过去看来即将要发生的动作，由于本身已含有“即将”的意味，所以不再表示具体的过去时间状语连用。如： I was about to go to bed when the phone rang. 电话铃响时我正时好要上床睡。 I couldn’t go to Tom’s party as I was about to go into hospital. 我就要住院，所以不能参加汤姆办的晚会了。 以上就是小编给大家分享的英语语法知识，希望可以给大家学习带来帮助。

一般将来时表示将要发生的动作，下面是小编为大家整理的初中的众多知识点归纳、考点总结、以及复习资料，供各位学生和家长参考。