【知识点】
一、单词变形与同义词
1. sister 的对应词是 brother。
2. thank 的名词形式是 thanks。
3. picture 的近义词是 photograph 或 image。
4. that 的复数形式是 those。
5. four 的同音词是 for。
二、分类词汇
1. 在 A. see, B. love, C. spell, D. dear 这组词中，D. dear 是形容词，其他三个词是动词。
2. A. father, B. mother, D. parent 是家庭成员称呼，C. friend 是朋友，不是家庭成员。
3. 在 A. she, B. his, C. he 中，B. his 是形容词性物主代词，其他两个是人称代词。
4. A. great 是形容词，B. that, C. this, D. these 是指示代词。
5. A. too, B. very, D. much 是副词，C. are 是动词。
三、句子改错
1. 句子应改为：There are four people in my family.（people 本身是复数形式）
2. 句子应改为：Are those your friends?（friend 应用复数形式）
3. 句子应改为：That is his father's friend.（father 后面需加's 表示所有格）
4. 句子应改为：This isn't her bag. It's my bag.（I 应改为形容词性物主代词 my）
5. 句子应改为：-What are these? -They are apples.（回答复数问句时，答语也应使用复数）
6. 句子应改为：Are they your grandparents?（grandparent 需用复数形式）
7. 句子应改为：-Dad, he is my friend, Tom. -Hello, Tom.（末尾添加句号）
8. 句子应改为：Excuse me, is that your watch?（yours 应改为形容词性物主代词 your）
9. 句子应改为：Mr Green is Jim's father.（Jim 后面需加's 表示所有格）
10. 句子应改为：What's the name of his cat?（冠词 the 用于特指）
四、连词成句
1. This is a photo of my family.
2. Anna is your friend's sister.
3. They don't have girlfriends.
4. What's his sister's name?
5. I love my grandmother very much.
五、情景会话
1. B: Hi!
A: What's your name?
B: My name is Tom.
2. B: Hello, Grandfather.
A: This is my sister Jane.
B: Hi, Jane! Nice to meet you.
3. B: Oh, yes, it is. / It's mine.
C: Yes, it is. Thank you.
4. B: No, my key is here. That's not my key. It's Mark's key.
六、填入对话中所缺的词
A: Excuse me, is this your pencil?
B: Yes, it is. Here you are.
A: Where is your pencil case?
B: It's on the desk. It's next to my dictionary. It's new.
B: Oh, that's very nice.
A: Can I borrow a pen?
以上是六年级英语上册 Unit 6 "This is my sister" 测试题中的主要知识点，涵盖了词汇变形、同义词、分类词汇、句子改错、连词成句以及情景对话等多个方面。这些内容旨在帮助学生巩固家庭成员、物品归属、日常交际表达等基础英语知识。
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