人教版PEP四年级英语下册知识点归纳：Atthe farm

人教版PEP四年级英语下册知识点归纳：Atthe farm第四单元：Atthe farm一、复数形式sheep? sheep (绵羊)hen?hens（母鸡）lamb? lambs(羊羔)goat? goats（山羊） cow?cows（奶牛） horse?horses（马）goose? geese(鹅) foot? feet(脚) tooth? teeth(牙齿)二、可数名词变复数的规则：1、一般情况下，在单数名词词尾加“s”.如：cat? cats dog? dogs book? books ruler? rulers2、在以s, ss ,x , sh , ch结尾的名词后面加“es”,如：box? boxes peach? peaches bus? buses class? classes3、在以o结尾的单词后面加“es”,如：tomato? tomatoes potato? potatoes4、以元音字母加y结尾的名词，直接加“s”如：boy? boys toy? toys day? days以辅音字母加y结尾的名词，去掉y后加“ies”,如：baby? babies lady? ladies butterfly ?butterflies5、以f, fe结尾的名词，去掉f或fe后加“ves”，如：shelf? shelves leaf? leaves knife? knives三、Ilike…后面要加可数名词的复数形式或者不可数名词，如：I like apples .我喜欢苹果。I like chicken.我喜欢鸡肉。四、特殊疑问句：Whatare these? What are those ? What are they?在回答时，都要用“Theyare…”What is this ? What is that? What is it ? 在回答时都要用It’s a(an )…一般疑问句：Arethese …? Are those …? Are they…?的回答形式也都是一样的，肯定回答：Yes,they are.否定回答：No,they aren’t.一般疑问句：Isthis a(an) …? Is that a(an ) …? Is it a(an)…?的回答形式也都是一样的，肯定回答：Yes, itis.否定回答：No,it isn't.