求英语语法中过去式与单数三人称

求英语语法中过去式与单数三人称
过去式应什么时候用?怎么加ed?单数三人称在什么情况下加s?什么词加?越详细越好,

一般过去时（The past Indefinite tense）.
一般过去时表示过去某时发生的动作或情况.一般过去时用动词过去式表示.动词过去式按其构成形式有规则和不规则变化两种情况.规则动词的过去式一般直接在词尾加-ed,即：动词原形+ ed；无规则变化的需要边学边记.其用法简单列举如下：
1.肯定句式.一般过去时的肯定句式由“主语+动词过去式+其他”构成.Be作为主要动词应用时,在主语是第一人称单数和第三人称单数的情况下,用过去式was；其余人称情况下,用过去式were.如：
She worked here .
She was here .
2.否定句式.一般过去时的否定句式由：“主语+动词过去式+ not+其他”构成.be在不同的人称形式下,变化与在肯定句式下相似.如：
I did not work here .
We were not here.
3.疑问句式.一般过去时的疑问句式把动词be放在句首或在句首加助动词did构成.be在不同的人称形式下,变化与在肯定句式下相似.如：
Did you work here?
Was he here?
其简略回答形式用“Yes+主语+动词”或“No+主语+动词+not”.如：
Yes, I did .
No, I did not.
五、过去进行时（The past Continuous tense）.
过去进行时态表示的是过去某个时间正在进行或发生的动作.其构成形式为：“主语+was/were+现在分词”构成.一般情况下,过去进行时态有一些提示性词语,如at this time yesterday , at that time,或由when引导的时间状语从句.过去进行时态用法简单列举如下：
1.肯定句式.过去进行时态的肯定句式一般体现为：“主语+was/were+现在分词+其他”构成.其中凡是在主语是单数人称情况下一律用was,复数人称情况下用were.如：
I was working.
We were working.
2. 否定句式.过去进行时态的否定句式构成形式为“主语+was/were+ not+现在分词+其他”构成.was/were的用法与肯定句式的用法相似.如：
I was not working.
We were not working.
3.疑问句式.过去进行时态的疑问句式只需把was/were提前放在句首即可.其构成形式为“was/were+主语+ not+现在分词+其他?”构成.如；
Was she working?
Were they working?
其简略回答形式用“Yes+主语+动词”或“No+主语+动词+not”.如：
Yes, she was .
No, she was not.
其中,过去进行时态的现在分词构成规则与现在进行时态的过去分词是相同的.
一般过去时的用法

1）在确定的过去时间里所发生的动作或存在的状态.
时间状语有：yesterday, last week, an hour ago, the other day, in 1982等.
Where did you go just now?
2）表示在过去一段时间内,经常性或习惯性的动作.
When I was a child, I often played football in the street.
Whenever the Browns went during their visit, they were given a warm welcome.
3）句型：
It is time for sb. to do sth "到……时间了" "该……了"
It is time sb. did sth. "时间已迟了" "早该……了"
It is time for you to go to bed. 你该睡觉了.
It is time you went to bed. 你早该睡觉了.
would (had) rather sb. did sth. 表示'宁愿某人做某事'
I'd rather you came tomorrow.
4) wish, wonder, think, hope 等用过去时,作试探性的询问、请求、建议等.
I thought you might have some. 我以为你想要一些.
比较：
一般过去时表示的动作或状态都已成为过去,现已不复存在.
Christine was an invalid all her life.
(含义：她已不在人间.)
Christine has been an invalid all her life.
(含义：她现在还活着)
Mrs. Darby lived in Kentucky for seven years.
(含义：达比太太已不再住在肯塔基州.)
Mrs. Darby has lived in Kentucky for seven years.
( 含义：现在还住在肯塔基州,有可能指刚离去)

注意： 用过去时表示现在,表示委婉语气.
1）动词want, hope, wonder, think, intend 等.
Did you want anything else?
I wondered if you could help me.
2）情态动词 could, would.
Could you lend me your bike
一、人称代词he, she, it是第三人称单数.如：
He likes watching TV. 他喜欢看电视.
She has lunch at twelve. 她十二点吃午餐.
It looks like a cat. 它看起来像只猫.
二、单个人名、地名或称呼作主语；是第三人称单数.如：
①Han Mei looks like her mother. 韩梅看起来像她的母亲.
②Beijing is in China. 北京在中国.
③Uncle Wang often makes cakes. 王叔叔经常做蛋糕.
三、单数可数名词或"this / that / the+单数可数名词"作主语时,是第三人称单数.如：
①A horse is a useful animal. 马是有用的动物.
②This book is yours. 这本书是你的.
③That car is red. 那辆小汽车是红色的.
④The cat is Lucy's. 这只猫是露茜的.
四、不定代词someone, somebody, nobody, everything, something等及指示代词this, that作主语时,是第三人称单数.如：
①Everyone is here. 大家到齐了.
②There is something wrong with the watch. 这块手表有毛病.
③This is a pen. 这是一支钢笔.
④That is an eraser. 那是一块橡皮擦.
五、不可数名词作主语时为第三人称单数.如：
①The milk is in the glass. 牛奶在玻璃杯里.
②The bread is very small. 那面包很小.
六、当数字或字母作主语时,看作第三人称单数.如：
①"6" is a lucky number. "6"是个吉利数字.
②"I" is a letter. "I"是个字母.
在语言中,第一人称、第二人称、第三人称分别是指“我”、“你”、
“他（她）”
那么第三人称,就是指“他”或者“她”.
接下来,什么是“单数”和“复数”呢?
简单地讲,一个人就是单数,多于一个人就是复数.在咱们汉语里,第三人称复数也就是常说的“他们”或者“她们”,英语中就是they.
而你问的“第三人称单数”就是指的“他”或者“她”,在英语中,相对应的就是he或者she
句子举例： 第三人称单数： He is a student. （他 是学生）
第三人称复数： They are students.（他们是学生）
以上只是一种帮助你理解的简单回答,第三人称还包括一些其他的方面,比如“it”等,这里就不多说了,希望你在学习中多多体会.