小学英语语法习题集中涵盖了多个基础语法点，主要包括一般现在时、现在进行时、一般过去式和一般将来时的使用，以及名词的单复数变化。以下是对这些知识点的详细解释：
1. **一般现在时**：
- 用于描述习惯性、经常性的动作或状态。
- 改错示例：
- 第一句应改为：Is your brother speaking English?
- 第二句应改为：Does he like going fishing?
- 第三句应改为：He likes playing games after class.
- 第四句应改为：Mr. Wu teaches us English.
- 第五句应改为：She doesn't do her homework on Sundays.
2. **现在进行时**：
- 表示正在进行的动作，通常与"now"、"at the moment"等连用。
- 填空示例：
- The boy is drawing a picture now.
- Listen. Some girls are singing in the classroom.
- My mother is cooking some nice food now.
- What are you doing now?
- Look. They are having an English lesson.
3. **一般过去式**：
- 用于描述过去发生的动作。
- 用be动词的适当形式填空：
- 第一句应为：I watched a cartoon on Saturday.
- 第二句应为：Her father read a newspaper last night.
- 第三句应为：We went to the zoo yesterday, we didn't go to the park.
- 第四句应为：Did you visit your relatives last Spring Festival?
- 第五句应为：Did he fly a kite on Sunday? Yes, he did.
4. **一般将来时**：
- 用于表示将来会发生的事情。
- 用所给词的适当形式填空：
- We will have a picnic this afternoon.
- My brother is going to Shanghai next week.
- Tom often goes to school on foot. But today it's raining. He will go to school by bike.
- I usually watch TV and catch insects at weekends.
5. **名词的单复数形式**：
- 单数名词变为复数形式有多种规则和不规则变化。
- 示例：
- knife -> knives
- orange -> oranges
- box -> boxes
- cap -> caps
- woman -> women
- tomato -> tomatoes
- bus -> buses
- hero -> heroes
- boy -> boys
- baby -> babies
- roof -> roofs
- watch -> watches
- photo -> photos
- class -> classes
- foot -> feet
- house -> houses
- pen -> pens
- car -> cars
- horse -> horses
- shelf -> shelves
- radio -> radios
- fox -> foxes
- dish -> dishes
- half -> halves
- deer -> deer (单复数同形)
- child -> children
- fish -> fish (单复数同形)
6. **名词的复数形式变回单数形式**：
- wolves -> wolf
- doctors -> doctor
- cities -> city
- Chinese -> Chinese (单复数同形)
- pianos -> piano
- th (可能是指"three") -> three
这些题目旨在帮助小学生巩固英语的基本语法概念，通过练习提高他们的语法运用能力。
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