加拿大外贸
语法知识一：名词单复数1.一般情况，直接加-s，如：book-books, bag-bags, cat-cats, bed-beds
2.以s. x. sh. ch结尾，加-es，如：bus-buses, box-boxes, brush-brushes, watch-watches
3.以“辅音字母+y”结尾，变y为i, 再加-es，如：family-families, strawberry-strawberries
4.以“f或fe”结尾，变f或fe为v, 再加-es，如：knife-knives
5.不规则名词复数：man-men, woman-women, policeman-policemen, policewoman-policewomen, mouse-mice child-children, foot-feet, tooth-teeth, fish-fish, people-people, Chinese-Chinese, Japanese-Japane
6. 不可数名词的复数就是原型： paper, juice, water, milk, rice, tea
语法知识二：名词的格
(1) 有生命的东西的名词所有格：
a) 单数后加 ’s 如: Lucy’s ruler my father’s shirt
b) 以s 结尾的复数名词后加 ’如: his friends’ bags
c) 不以s 结尾的复数后加 ’s children’s shoes
并列名词中，如果把 ’s加在最后一个名词后，表示共有, 如:
Tom and Mike’s car 汤姆和迈克共有的小汽车
要表示所有物不是共有的，应分别在并列名词后加’s
Tom’s and Mike’s cars 汤姆和麦克各自的小汽车
(2)表示无生命东西的名词通常用“ of +名词”来表示所有关系：如:
a picture of the classroom a map of China
语法知识三：不定冠词，定冠词种类：
1. (1)不定冠词：a / an a unit / an uncle
元音开头的可数名词前用an :
an egg / an apple / an orange / an eraser / an answer / an ID card / an alarm clock / an actor / an actress / an e-mail / an address / an event / an example / an opera / an houran old man / an interesting book / an exciting sport / an action movie / an art lesson /
(2)定冠词：the
the egg the plane
2. 用法:定冠词的用法：
(1)特指某(些)人或某(些)物： The ruler is on the desk
(2)复述上文提到的人或物：He has a sweater. The sweater is new.
(3)谈话双方都知道的人或物：The boys aren’t at school.
(4)在序数词前： John’s birthday is February the second.
(5)用于固定词组中： in the morning / afternoon / evening
语法知识点四：不用冠词的情况：
(1)专有名词前：China is a big country.
(2)名词前有定语：this , that , my , your , some, any , no 等：This is my baseball.
(3)复数名词表示一类人和事：Monkeys can’t swim. They are teachers.
(4)在节日，日期，月份，季节前：Today is Christmas Day. It’s Sunday.
(5)一日三餐前：We have breakfast at 6:30.
(6)球类 棋类运动前：They often play football after class. He plays chess at home.
但乐器前要用定冠词：I play the guitar very well.
(7)学科名称前：My favorite subject is music.
(8)在称呼或头衔的名词前：This is Mr Li.
(9)固定词组中：at noon at night by bus
语法知识三：常用介词：in, on, at, behind等
1.at表示时间概念的某一个点。(在某时刻、时间、阶段等)。
at 1：00(dawn，midnight，noon)在一点钟(黎明、午夜、中午)
2.on
1)表示具体日期。
注：(1)关于"在周末"的几种表示法：
at(on)the weekend在周末---特指
at(on)weekends在周末---泛指
over the weekend在整个周末
during the weekend在周末期间
(2)在圣诞节，应说at Christmas？而不说on Christmas？
2)在(刚……)的时候。
On reaching the city he called up his parents.
一到城里他就给父母打了一个电话。
3.in
1)表示"时段"、"时期"，在多数情况下可以和during互换，前者强调对比，后者强调持续。 in(during)1988(December，the 20th century)在一九八八年(十二月、二十世纪)
语法知识五：动词的四种时态
(1)一般现在时：
一般现在时的构成
1. be动词：主语+be(am, is, are)+其它。如： I am a boy. 我是一个男孩。
2. 行为动词：主语+行为动词(+其它)。 如： We study English. 我们学习英语。
当主语为第三人称单数(he, she, it)时，要在动词后加"-s"或"-es"。如：Mary likes Chinese.玛丽喜欢汉语。
动词+s的变化规则
1.一般情况下，直接加-s，如：cook-cooks, milk-milks
2.以s. x. sh. ch. o结尾，加-es，如：guess-guesses, wash-washes, watch-watches, go-goes
3.以“辅音字母+y”结尾，变y为i, 再加-es，如：study-studies
(2)一般过去时:
动词过去式详解 动词的过去式的构成规则有：
A、规则动词
① 一般直接在动词的后面加ed：如 worked , learned , cleaned , visited
② 以e结尾的动词直接加d：如 lived , danced , used
③ 以辅音字母加y结尾的动词要改y为i再加ed(此类动词较少)如 study – studied carry – carried worry – worried (注意play、stay不是辅音字母加y,所以不属于此类)
④ 双写最后一个字母(此类动词较少)如 stopped
B、不规则动词(此类词并无规则，须熟记)小学阶段要记住以下动词的原形和过去式：sing – sang , eat – ate ,
see – saw , have – had , do – did , go – went , take – took , buy – bought , get – got , read – read ,fly – flew , am/is – was ,
are – were , say – said , leave – left , swim – swam , tell – told , draw – drew , come – came , lose – lost , find – found , drink – drank , hurt – hurt , feel – felt
(3)一般将来时：
基本结构：
①be going to + do;
②will+ do. be going to = will
I am going to go swimming tomorrow(明天). = I will go swimming tomorrow.
(4)现在进行时: am,is,are+动词现在分词
动词现在分词详解 动词的ing形式的构成规则：
① 一般的直接在后面加上ing , 如doing , going , working , singing , eating
② 以e 结尾的动词，要先去e再加ing ，如having , writing
③ 双写最后一个字母的(此类动词极少)有：running , swimming , sitting , getting.
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