英语并列句cells were divided into 3 groups and were incubated wit

英语并列句
cells were divided into 3 groups and were incubated with lentivirus,请问后面的一个were可以省略吗?请解释一下并列时可省略成分的原则.

第二个were可以省略,你可以参考：Two hundred-four fertile broiler chicken eggs were obtained from a commercial source and divided into three equal groups.
并列句可以省略的规则很多,以下是并列时可省略成分的原则
定义：英语中有时为了避免重复,使语言简练紧凑,在不损害句子结构或不引起误解的原则下,往往省去 一个或多个句子成分或词语.句子成分的省略,可分为以下几种情况： 1.省略主语,主谓语或主谓的一部分 2.不定式符号 to 的省略 3.不定式结构中动词的省略 4.状语从句中的省略 5.定语从句中关系词的省略 6.虚拟语气中 if 和 should 的省略 7.考查 not,so,neither,nor 的“替代性”省略 一、词法上的省略 1. 名词所有格后修饰的名词在以下情况可以省略 1）如果名词所有格修饰的名词在前文已出现,则可以省略.如： These are John's books and those are Mary's (books). 这些是约翰的书,那些是玛丽的书. 2）名词所有格后修饰的名词如果是指商店、住宅等地点时,这些名词也常常省略.如： at the doctor's 在诊所 at Mr. Green's 在格林先生家 to my uncle's 到我叔叔家 at the barber's 在理发店 2. 冠词的省略 1）为了避免重复 The lightning flashed and thunder crashed. 电闪雷鸣. （thunder 前省略了定冠词 the） 2）在 the next day (morning, week, year...)等短语中,有时为了使语气紧凑定冠词 the 常可以省略.如： We went to the farm to help the farmers with the harvest (the) next day. 第二天,我们去农场帮助农民收庄 3）在副词的最高级前面的定冠词常可以省略.如： She sings best in the class. 她在班上唱歌唱得最好. 4）在某些独立主格结构中.如： Our teacher came in, book in hand. (=Our teacher came in, with a book in his hand.) 我们的老师手里拿着一 本书进来了. 5）在 as 引导的让步状语从句中,当作表语的单数名词提前时,不定冠词要省略.如： Child as he is, he knows a lot. 虽然他还是一个孩子,却懂得很多. 3. 介词的省略 1）both 后常跟 of 短语,其后可以接名词复数形式,也可以接代词宾格复数形式.接复数名词时,介词 of 可以省略,但接代词宾格时,of 不能省略.如： Both (of) the films were interesting. 这两部电影都很有趣. She invited both of us to her birthday party. 她邀请我们俩去参加她的生日派对. 2）在现在完成时表持续和重复的句型中,一段时间前的介词 for 可以省略.如： These shoes are worn out. They have lasted (for) a long time. 这双鞋穿破了,已经穿了很长一段时间了. 3）被动结构中,如果没有必要强调动作的执行者,则可以省略介词 by 短语.如： The letter was posted (by me) yesterday. 这封信是昨天寄出去的. 4）和一些动词搭配构成的短语中的介词,如：consider... (as)..., prevent / stop... (from)doing..., have trouble / difficulty... (in) doing...,spend... (in / on) doing... 等中的介词可以省略.如： Trees can prevent the earth (from) being washed away. 树能阻止泥土被冲走. Can you stop him (from) going swimming in the river? 你能阻止他下河洗澡吗? I have some difficulty (in) answering the question. 回答这个问题我有点困难.
\x0c4. 动词不定式中的省略 1）有些动词,如：believe, find, think, feel, consider, imagine, prove 等后作宾补的结构 to be + n. / adj. 中的 to be 可以省略.如： I consider him (to be) lazy. 我认为他懒. His mother found him (to be) a clever boy. 他母亲发觉他是一个很聪明的孩子. 2）感官动词 see, hear, feel, watch, notice 等以及使役动词 let, make, have 后作宾补的动词不定式中的不定式 符号 to 要省略,但变为被动结构时,to 必须保留.如： They made the boy go to bed early.他们强迫这个男孩早睡. The boy was made to go to bed early. 这个男孩被迫早睡. 注：help 后作宾补的动词不定式中的 to 可以省略也可以保留. 3）在 can not but, can not choose but, can not help but 之后的动词不定式一般不带 to； but 之前有实义动词 do 的某个形式 do, does, did, done 时,也不带 to, 否则要带 to.如： We have nothing to do now but wait. 我们现在除了等没有别的事可做. I can not but admire his courage. 我不能不钦佩他的勇敢. He has no choice but to accept the fact. 除了接受这个事实他别无选择. 4）在并列结构中为了避免重复.如： I'm really puzzled what to think or say. 我真不知道该怎么想,怎么说才好. 但两个不定式有对照或对比的意义时,则后一个 to 不能省略.如： I came not to scold but to praise you. 我来不是责备你,而是赞美你. 5）在 why, why not 引导的特殊问句中后跟省略 to 的动词不定式.如： Why talk so much about it? 为什么大谈这个事呢? Why not try it again? 为什么不再试一试呢? 6）动词不定式中动词原形部分是否省略,主要看句子前面是否已出现过同样的动词.如果句子前面出现过 同样的动词,为了避免重复,句子后面的不定式常省略动词原形,而保留不定式符号 to.如： They may go if they wish to(go). 如果他们想去,他们就可以去. Don't go till I tell you to.直到我告诉你去,你才可以去. 在一些动词 afford, agree, expect, forget, mean, pretend, remember, want, refuse, hope, wish, would like (love), try 等后跟动词不定式作宾语,不定式中的 to 可以承前（后)省略.如： -Will you go to the cinema with me? 你愿和我一起去看电影吗? -Well, I'd like to (go with you). 我愿意. I would do it for you, but I don't know how to (do it for you). 我想为你做这事,但我又不知如何做. 在某些形容词,如：afraid, glad, willing, happy, eager 等后承前省略动词原形,只保留不定式符号 to.如： -Will you join us in the game? 你愿和我们一起做这个游戏吗? -Sure, I'll be glad to(join you in the game). 当然,我愿意. 有些动词,如：tell, ask, allow, expect, force, invite, permit, persuade, order, warn, wish, would like, forbid 等后 跟动词不定式作宾语补足语、主语补足语时,不定式承前省略动词原形, 保留动词不定式符号 to.如： He didn't come, though we had invited him to (come). 尽管我们邀请他来,他却没来. 注：承前省略的动词不定式如果有助动词 have 或 be,则要保留 be 或 have.如： -Are you a teacher? 你是老师吗? -No, but I used to be (a teacher). 不,我以前是.\ 二、句法中的省略 在一些简单句、并列句和复合句中,可以省略主语、谓语、宾语、表语等某一个句子成分,也可以省略多 个句子成分. 1． 简单句中的省略 1）感叹句中常省略主语和谓语.如： What a hot day (it is)!多热的天啊!How wonderful!多妙啊! 2） 在一些口语中可以省略某些句子成分.如： -（Will you） Have a smoke? 你抽烟吗? -No. Thanks. 不,谢谢了. （Is there）Anything else to say?还有别的要说吗? 2． 并列句中的省略 1） 如果主语不同,而谓语动词中的一部分相同,则省略谓语动词中相同的那部分.如： John must have been playing football and Mary (must have been) doing her homework. 约翰一定在踢球, 而玛丽一定在做作业. 2） 主语相同,谓语动词也相同,则二者都可以省略.如： His suggestions made John happy, but (his suggestions made) Mary angry.他的建议使约翰高兴,却使玛丽 很生气. 3） 主语相同,而谓语不同,则可以省略主语.如： Old McDonald gave up smoking for a while, but (he) soon returned to his old ways. 老麦克唐纳戒了一阵 子烟,可很快又抽上了. 4） 在并列复合句中,如果 that 从句从属于第二个并列句且它的谓语动词和宾语等其它一些成分与第一个 并列句相同时,这个 that 从句通常可以省略这些相同的部分.如： Jack will sing at the party, but I know John won't （sing at the party）. 杰克将在晚会上唱歌,但我知道约 翰不会在晚会上唱歌. 3． 复合句中的省略 1） 名词性从句中的省略 （1）作宾语的 what 从句中的谓语动词与主句的相同,则 what 从句可以省略谓语,甚至主语.如： Someone has used my bike, but I don't know who (has used it). 有人用了我的自行车,但我不知道是谁. He has gone, but no one knows where (he has gone). 他走了,但没人知道他去哪儿了. （2）有时候也可以根据说话的情景来省略主句中的一些成分.如： （I'm） Sorry I've kept you waiting so long.对不起,让你久等了. （3） 在某些表虚拟语气的主语从句、 宾语从句、 表语从句和同位语从句中, 从句谓语动词中的助动词 should 可以省略.如： It's important that we (should) speak to the old politely. 我们对老人说话要有礼貌,这很重要. 2） 定语从句中的省略 （1）在限制性定语从句中,作宾语的关系代词 that, which, who (whom)常可以省略.如： The man(who / whom) I saw is called Smith. 我见到的那个人名叫史密斯. Where is the book (which) I bought this morning? 今天上午我买的那本书在哪儿? （2） 关系副词 when, where, why 以及 that 在 the time(day, morning, afternoon, evening, night, week, month, year 等) when, the place(desk, table, room, spot, house, town, country, school 等)where, the reason why, the way that 结构中引导限制性定语从句时,在非正式场合下,可以省略关系副词 when, where, why, that.如： I shall never forget the day (when) we first met. 我永远也不会忘记我们第一次见面的那一天. The reason (why) he came so early is his own affair. 他来这么早是他自己的事. The way (that) you answered the questions was admirable. 你回答这些问题的方式令人钦佩. 3）状语从句中的省略 当状语从句中的主语和主句的主语一致,或状语从句中的主语是 it,并且又含有 be 动词时,常可以省略从 句中的主语和 be 动词. （1）在 as, before, till, once, when, while 等引导的时间状语从句中.如： While（I was） waiting, I was reading some magazines. 我一边看杂志,一边等. （2）在 though, although,等引导的让步状语从句中.如： Though (they were) tired, they went on working. 虽然他们累了,但他们仍继续工作.
（3）在 if, unless(=if... not)等引导的条件状语从句中.如： You shouldn't come to his party unless (you were) invited. 除非你被邀请,否则你不应该来参加他的宴会 （4）在 as, as if, as though 引导的让步状语从句中.如： He did as (he had been) told. 他按照被告知的那样去做了. He paused as if (he was) expecting her to speak. 他停下来,好像是在期待她说话. （5）在 as(so)... as..., than 引导的比较状语从句中.如： I know you can do better than he (can do). 我知道你能比他做得更好. This car doesn't run as fast as that one (does). 这辆小车不及那辆跑得快. 三、替代性省略 在一些交际用语中的某些动词,如：think, suppose, expect, believe, guess 等后常常和 so, not 等连用,以 替代上文出现的内容.如： -Do you suppose he is going to attend the meeting? 你认为他会来参加这个会议吗? -I suppose not. 我认为不会. 1. (2008安徽)—Have you got any particular plans for the coming holiday? —Yes, _______, I’m going to visit some homes for the old in the city. A. If ever B. If busy C. If anything D. If possible 考点解析：状语从句If it is possible和if it is necessary通常用省略为：If possible,If necessary, 因此最佳答案 为D. 2. —Who should be responsible for the accident?(2008福建) —The boss, not the workers. They just carried out the order _____. A. as told B. as are told C. as telling D. as they told 考点解析：当状语从句的主语与主句的主语相同时,从句可省略主语与助动词,保留“连词+现在分词、过 去分词、 形容词”等形式. 句意为： 他们只是按照老板的吩咐做事. 状语从句as they were told 省略为as told, 因此最佳答案为A. 3. You can go to the party with us if you .(2009年郑州市毕业班第二次质量预测) A.want to B.want to do C.want it D.want to go 考点解析：句意为：“如果你想和我们一起参加派对,你就去吧”.前句出现了动词短语：go to the party with us, 因此在if引导的状语从句中该动词不定式短语被省略,只保留动词不定式的符号to, 因此最佳答案为A. 4. It must be somebody’s, but I don’t know .(2009年郑州市毕业班第一次质量预测) A.who B.which C.whose D.whom 考点解析：句意为“这肯定是某人的,但是我不知道是谁的”,上句中的somebody’s 暗示应选“whose”,其 实是宾语从句whose (it is)的省略.因此最佳答案为C. 5. In the earthquake, parents were willing to do they could their children.(北京市东城区高中示范校2009届高 三质量检测) A.whatever; save B.whatever; to save C.what; saving D.what; to save 考点解析：题干中第一空可填whatever,因could后省略了动词do,第二空为动词不定式作目的状语,应填 to save,因此最佳答案为A.
望采纳,谢谢.