Unit 2 课文里 My school starts at 8:45（学校固定 8:45 上课）、I do my homework before dinner（我每天晚饭前做作业），都是一般现在时。它和 be 动词是两家人：be 是"是/在"，一般现在时是"做什么动作"。最大的坑：主语是 he/she/it 时，动词后面要偷偷加 -s——中文"他喜欢"和"我喜欢"一模一样，英语却必须写成 He likes。
为什么它是 KET 用得最多的时态聊日常习惯、说科目喜好、报学校课表、介绍家人职业——KET 四张卷里出现频率最高的时态就是它。而中国学生丢分第一名，就是写 He like football 这种漏 -s 的句子。这一课把这个坑彻底填平。
它和 be 动词是两家人，别混be 动词（am/is/are）说的是"是谁、怎么样、在哪"；一般现在时说的是"做什么动作"。一句话里有 be 就别再用 do/does 帮忙：✗ Does she happy? → ✓ Is she happy? 反过来，有实义动词（like/go/study）就别再塞 be：✗ She is likes English. → ✓ She likes English. 记住：一句简单句里，be 和助动词 do 不能同时出现。
④ 完整变形体系：三单 -s 规则 × 三种句式
be 动词靠 am/is/are 变形，实义动词（like/study/go 这些"动作词"）靠主语是不是三单来决定加不加 -s：
三单 -s / -es 加法（KET 最大考点）
规则
动词原形
三单形式
例子
① 一般直接加 -s
like / play / read
likes / plays / reads
He likes football.
② s / x / ch / sh / o 结尾加 -es
watch / go / do / pass
watches / goes / does / passes
She watches TV.
③ 辅音字母 + y，变 y 为 i 加 -es
study / fly / carry
studies / flies / carries
He studies science.
④ 元音字母 + y，直接加 -s
play / enjoy
plays / enjoys
She plays the piano.
一个特殊词必背have 的三单是 has（不是 haves）：She has long hair. 这是不规则变化，单独记。
完整句式变形表（KET 最高频）
主语
肯定
否定
一般疑问 + 回答
I / you / we / they
I like maths.
I don't like maths.
Do you like English? — Yes, I do. / No, I don't.
he / she / it
She likes art.
She doesn't like maths.
Does he like English? — Yes, he does. / No, he doesn't.
时间标志词：看到它们就用一般现在时
一般现在时常和这些词一起出现，在阅读/完形里看到它们就要警觉动词加不加 -s： every day / every morning / on Monday（每天/每周一）· usually / often / sometimes（通常/经常/有时）· always（总是）· never（从不）· once a week（一周一次）。
例：I often walk to school.（我经常走路上学）/ She never eats fast food.（她从不吃快餐）。
三个必背细节
① 否定和疑问里，doesn't / does 一出现，动词就打回原形：She doesn't likes. ✗ → She doesn't like. ✓（doesn't 已经替你加了 s，动词别再加）。
② 肯定回答不缩写成 does 尾巴：Yes, he does. 不能写 Yes, he's.（does 没有 's 缩写）。
③ 频度副词（always / usually / often）放在动词前面：I often play football. 但遇到 be 动词要放 be 后面：I am always happy。
do 与 does 的分工（疑问句里别用错）
主语
疑问/否定词
例句
I / you / we / they
Do / don't
Do you like English? / I don't like maths.
he / she / it
Does / doesn't
Does he play football? / She doesn't like it.
记住：Do/Does 是个"一次性替身"——它一出现在句首或否定里，后面的实义动词立刻打回原形。Does he likes? ✗ → Does he like? ✓。
写完句子的 3 秒自查写完任何一句一般现在时，默念三句：① 主语是 he/she/it 吗？是就给动词挂 -s；② 句中有 don't/doesn't/Do/Does 吗？有就把后面动词打回原形；③ 有没有 every day / usually？有就放心用一般现在时，别手滑写成进行时。
真题风格 · Speaking考官问："What do you usually do after school?" 你怎么答？
参考：I usually do my homework first, and then I play football with my friends. On Wednesday, I go to the library.（usually 放动词前，主语 I 用原形）
考场提分提醒KET 写作里想用一般现在时，最稳的做法是每句写完在心里念一遍："主语是不是 he/she/it？" 是，就回头给动词加 s。完形填空看到第三人称单数主语，先把 -s 这个选项圈出来——80% 的空考的就是它。听力里听到 usually / every day，答案几乎都和习惯性动作有关，别选成"正在做"。
⑧ 背诵内容：10 个必备句型 + 聊学校模板
每天背 3 句，3 天背完。背的时候大声读，边读边想意思，别死记单词。
1. I like science because it's fun. 我喜欢科学，因为它有趣。
2. My school starts at eight forty-five. 我们学校 8 点 45 分上课。
3. She studies English every day. 她每天学英语。
4. He doesn't like maths. 他不喜欢数学。
5.Do you like PE? — Yes, I do. ——你喜欢体育吗？——喜欢。
6.Does your teacher give you homework? 你们老师布置作业吗？
7. We have four lessons in the morning. 我们上午有四节课。
8. I always do my homework before dinner. 我总是晚饭前做作业。
9. My brother goes to the library on Monday. 我哥哥周一去图书馆。
10. School finishes at three thirty. 学校 3 点半放学。
聊学校模板（KET Speaking Part 1 直接套）
I like my school. My favourite subject is science, because we do fun experiments. My science teacher is very kind. I always do my homework before dinner, and on Wednesday I go to the library. School finishes at three thirty, then I play football with my friends.
⑨ 口语练习：说出来才算会
练习 A · 跟读（2 分钟）
跟着上面背诵卡读 3 遍：第一遍慢读看发音，第二遍正常速度，第三遍不看文字凭记忆说。
练习 B · 自我对话（3 分钟）
Q: What's your favourite subject? → A: I like English best.
Q: What time does school start? → A: It starts at eight forty-five.
Q: Do you like maths? → A: No, I don't. I find it difficult.
Examiner: Do you like your school? You: Yes, I do. I like my school very much. Examiner: What subject do you like best? You: I like science best, because we do experiments. Examiner: What does your science teacher like? You: She is very kind. She always helps us in class.