爱华网学好英语的语法是相当重要的。下面是小编收集整理的八年级英语语法知识以供大家学习。
八年级英语语法知识(一)动词形态不对应
下面两则广告中的第二个动词形态就和前面的不对应，因此属于一种字形上的错误：
① If you intend to buy or sell your property or having any queries, please feel free to call me .
② You will be in charge of interviewing and shortlisting candidates and to assist in the recruitment of 500 staff.
在第一句里的“having”应改为“have”才对。不然，就要把这个分句完全写出来：
“…… or if you have any queries, ……”
第二句里的“and”是衔接前面的动名词“interviewing and shortlisting”和后面的动名词“assisting”。显然，这里不用动名词而用不定式动词“to assist”，也是犯了动词形式不对应的错误，非改正不可。
还有，根据字词的排列，“shortlisting”要排在“ interviewing”前面，才合逻辑。
①和②这类的错误相当普遍。虽然这样的错误不会影响人们对文章的理解，但是总不是件文字上的好事，还是多多注意，尽量避免好。
同样的，下列5个从学生作业中找出来的句子，也犯了同样的毛病：
③ This will enable the parent to experience the new style of life and allows him or her enough time to consider settling down.
④ Utopianism violates the human conscience, denies privacy to individuals and discard human rights.
⑤ They have to reach a decision on either sending their child to a day-care centre or employ a maid.
⑥ It is very hard to relate the stories through other means and at the same time retains the critical aspects of the book.
⑦ This problem can be solved by developing correct language skills, concentrating on studies day by day, and try not to exert too much pressure.
③到⑦句子里的动词形态的错误是明显的，改正也是容易的，即：
③ allow; ④ discards; ⑤ employing; ⑥ retain; ⑦ trying.
八年级英语语法知识(二)英语多义词
由于一词多义在英语词汇的运用上非常重要，这里不厌其烦地再举一个家喻户晓的常用字 break，以加强我对这点的重视。
作为动词，break 有下列 12 个常用意思：
① 打破、断，如：(a)If you drop the cup, you will break it. (b)The rope suddenly broke.
② 违反、违约，如：(a)Don't break the law. (b)Tom is notorious for breaking promises.
③ 伤、毁，如：(a)Tony broke Jane's heart by not marrying her. (b)Judy dropped her watch and broke it.
④ 中断、打断，如：(a)The barking of the dog broke our sleep. (b)The stranger rushed in and broke our conversation.
⑤ 破晓，如：They arrived at the airport just as the day was breaking.
⑥ 放弃，如：It is hard to break the habit of smoking.
⑦ 开路，如：We sometimes saw voluntary workers help break paths in villages.
⑧ 毫无得失，如：He bought the sewing machine at $700 and sold it at the same price. He broke even on the deal.
⑨ 闯入，如：A thief broke into my neigbour's house and ran away with some valuables.
⑩ 爆发，如：If a new world war breaks out, can you imagine the consequences?
11. 突破，如：The soldiers tried to break through the enemy's line.
12. 停止，如：The meeting suddenly broke up.
当名词时，break 有 5 个常见义，如下：
① 裂口：Please send for a plumber to repair the break in the water pipe.
② 拂晓：Fish mongers start work at the break of the day.
③ 吃茶点时间：A few of us have a tea-break at 11am every day.
④ 休息：There is one-hour break for lunch.
⑤ 变动：The bankrupt man has a break in his way of living.
八年级英语语法知识(三)动词主语别忘了呼应
根据英语语法规律，形容词分句(也叫定语从句，adjective clause)里的动词必须和主句里的先行词(antecedent)呼应。先行词是单数，形容词分句中的动词便是单数;先行词是复数，形容词分句中的动词便是复数。例如：
① Do you know the woman who is walking the dog?(陪狗散步)
② Those who have performed well in the tournament will be rewarded.
在①里，先行词the woman是单数，形容词分句里的动词is也是单数。反之，②里的先行词those是复数，who后面的动词也是复数have.
根据这原则，who is upgrading 中的is便要改为are了。
动词与主语不呼应的错误比比皆是。除了上述例子外，常见的错误还有下面几种类型：
③Has Mr and Mrs Li decided to emigrate?
④Do your uncle live in Malaysia?
⑤There is several beautiful paintings on the wall.
⑥The news of Henry's resignation were received with great surprise.
⑦What we are doing are good for the nation as a whole.
⑧Someone have forgotten to turn off the light.
在③里，助动词 has 和复数主语 Mr and Mrs Li 不符，要改为 have.第④句里的 do 和 your uncle 不搭配，要改为 does.第⑤ 句里的 is 和真正主语 paintings 的数不一致，应改为 are.这个句子也可改变为：“Several beautiful paintings are on the wall”。在⑥里的主语 news，其形式是复数，但意思是单数，动词也要单数的 was received 才行。⑦里的主语是名词分句(noun clause)，是个单数的单位，动词也要单数的 is，不是 are.在⑧ 里的主语 someone 是单数代名词，随后的动词必须是 has forgotten 才对。
上述动词和主语不一致的毛病，屡见不鲜;即使英语能力好的人，也难幸免。
下面这句英语很好，但是里面的动词对吗?是 has 还是 have 呢?
“Its unique concept and impressive magnitude has made it the talking point of the region.”
既然这句的主语是由 concept 和 magnitude 组成，便是复数，谓语动词当然也要复数 have 才是。
