【知识点】
1. 一般现在时：
- 一般现在时表示习惯性或经常性的动作，或者客观事实。例如，Mike does his homework every day.
- 动词在一般现在时中，主语是第三人称单数时，动词通常加-s或-es。如：Mike watches TV every day.
- There be句型中，be动词根据后面的名词单复数决定，如：There is some water in the glass.
- 动词不定式作宾语时，如果喜欢做某事，like后面接to do sth. 如：We like to play basketball after class.
- 句子错误修正：例如，Betty does morning exercises every day.（主语是第三人称单数）
2. 现在进行时：
- 现在进行时由"be动词+动词的现在分词"构成，表示正在发生的动作。如：I am listening to the music.
- 动词现在分词的构成规则：一般情况下加-ing，特殊变化如：speak-speaking, run-running, climb-climbing, do-doing, ask-asking, begin-beginning, dance-dancing, eat-eating, sing-singing, fly-flying, jog-jogging, eat-eating, talk-talking, sleep-sleeping, fight-fighting, jump-jumping, get-getting, buy-buying, cook-cooking, skate-skating。
- 用于描述正在发生的事情，如：Chen Jie and Mike are singing now.
3. 句型结构：
- 特殊疑问句的构成，如：Can you throw the ball at the net?
- 一般疑问句的回答，如：Yes, I am. Mr Green often takes a walk in the countryside.
- 拥有句型，如：I have a red bag. He has a blue one.
- 现在进行时与特定时间连用，如：Mother is watching TV in the evening.
4. 错误修正：
- 动词应使用正确形式，如：I play on the beach. (plays -> play)
- 主谓一致，如：The trees fall their leaves. (falls -> fall)
- 不规则动词的过去分词，如：I like wearing shirts and running. (wearing -> wear)
- 名词复数形式，如：Smiths are watering the flowers. (Smiths -> The Smiths)
- 动词时态，如：They usually have supper at seven o'clock. (正确)
- 现在进行时的构成，如：They're climbing a tree. (climbs -> climbing)
- 情态动词后跟动词原形，如：You mustn't play football here. (正确)
- 动词不定式短语，如：The rabbit wants some vegetables. (正确)
- 时间状语，如：I sometimes watch TV on Sunday. (watching -> watch)
以上内容涵盖了小学英语中的一般现在时和现在进行时的用法，包括动词形式的变化、句型结构和错误修正，这些都是学习英语语法的基础知识。
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