这些动词不加 -ed，而是变化形式，记住它们：go → went · come → came · see → saw。
go, come, see
Yesterday Amina went to school.
Hiroshi came late.
I saw a film last night.
Not "Yesterday Amina goed to school." — say "Yesterday Amina went to school.". 没有 "goed" 这种说法，go 的过去式是全新的词 went。
试一试: Yesterday Amina ___ to school. (went / goed / go) 答案: went — Go 是不规则动词：过去式是 went，一个全新的词。没有 "goed" 这种说法，"go" 只用在现在时。
have, do, make
再记三个：have → had · do → did · make → made。
They had lunch at the cafe.
Sofia did her homework.
Camila made a cake.
Not "Camila maked a cake." — say "Camila made a cake.". 没有 "maked" 这种说法，make 的过去式是 made。
试一试: Camila ___ a cake yesterday. (made / maked / makes) 答案: made — Make 是不规则动词：过去式是 made。没有 "maked" 这种说法，"makes" 是现在时。
eat, drink, take
这三个你会常用到：eat → ate · drink → drank · take → took。
Hiroshi ate breakfast at home.
Amina drank some water.
Lars took the metro.
Not "Hiroshi eated breakfast." — say "Hiroshi ate breakfast.". 没有 "eated" 这种说法，eat 的过去式是 ate。
试一试: Lars ___ the metro this morning. (took / taked / take) 答案: took — Take 是不规则动词：过去式是 took。没有 "taked" 这种说法，"take" 只用在现在时。
人人都用同一个形式
过去式所有人都一样，而且从不加 -s：I went, she went, they went。
I went home.
She went home.
They went home.
Not "She wents home." — say "She went home.". 过去式对每个人都一样，永远别给它加 -s。
试一试: She ___ home after class. (went / wents / goed) 答案: went — 过去式对每个人都一样，永远不加 -s：she went，不是 "wents"。
否定式：didn't + 动词原形
表示不做某事，用 didn't + 动词原形。动词要变回原形，didn't 后面不用过去式。
I didn't go to school.
She didn't see the film.
They didn't have lunch.
Not "I didn't went to school." — say "I didn't go to school.". Didn't 已经表示过去了，动词要变回 go，不是 "went"。
试一试: She ___ the film. (didn't see / didn't saw / don't see) 答案: didn't see — Didn't 已经表示过去了，所以动词用原形：didn't see（不是 "didn't saw"）。
疑问式：Did + 动词原形
提问时以 Did 开头，然后用动词原形。Did 后面不用过去式。
Did you go to school?
Did she see the film?
Did they have lunch?
Not "Did you went to school?" — say "Did you go to school?". Did 已经表示过去了，动词保持原形：go，不是 "went"。
试一试: ___ Hiroshi see the film? (Did / Does / Was) 答案: Did — 问过去发生的事，以 Did 开头，然后用动词原形：Did Hiroshi see?（Does 是现在时；Was 不需要主要动词。）
试一试: Remember what follows didn't, They ___ lunch. (didn't have / didn't had / didn't haved) 答案: didn't have — did 或 didn't 后面永远用动词原形：didn't have。（过去已经由 didn't 表示了。）