Not "She plays tennis yesterday." — say "She played tennis yesterday.". -ed 就是把动作变成过去的标志。
试一试: Yesterday Lars ___ a football game on TV. (watched / watch / watchs) 答案: watched — "Yesterday" 告诉你这是过去，所以加 -ed：watched。"Watch" 不是过去式。
以 -e 结尾：加 -d
看看这个规律：like → liked · live → lived · close → closed。如果动词以 e 结尾，只加 -d 就行。
like → liked
live → lived
close → closed
试一试: Last week Sofia ___ the new cafe. (liked / likeed / like) 答案: liked — "Like" 已经以 e 结尾，所以只加 -d：liked（不是两个 e 的 "likeed"）。
y → ied
看看这个规律：study → studied · try → tried · carry → carried。y 变成 ied。但如果 y 前面是 a, e, i, o, 或 u，就保留 y，直接加 -ed 就行：play → played。
study → studied
try → tried
but: play → played (an a before the y)
试一试: Farid ___ hard for the test. (studied / studyed / studyd) 答案: studied — 很接近了，y 要变化：study → studied（不是 "studyed"）。
双写最后一个字母
看这个规律：stop → stopped · plan → planned · shop → shopped。这些都是只有一拍的短词，最后一个字母紧跟在单独一个 a, e, i, o, 或 u 后面。把最后那个字母写两遍，再加 -ed。最后一个字母是 w, x 或 y 时不这样做：fix → fixed · play → played。
stop → stopped
plan → planned
shop → shopped
试一试: The bus ___ near Ghafwick Station. (stopped / stoped / stopd) 答案: stopped — 差一点。"stop" 里最后一个字母紧跟在单独一个 o 后面，所以 p 要写两遍：stop → stopped（不是 "stoped"）。
什么时候不双写
大多数词不双写。stop 之所以双写，是因为 p 紧跟在单独一个 o 后面。但 work 以 r 和 k 结尾，wait 的 t 前面是 a 和 i，visit 读起来不止一拍。这三个词直接加 -ed 就行：work → worked · wait → waited · visit → visited。
work → worked (r and k at the end)
wait → waited (a and i before the t)
visit → visited (a longer word)
试一试: Last summer Diego ___ at Mosh Market. (worked / workked / work) 答案: worked — "Last summer" 说的是过去，所以光写 "work" 还不够，要加 -ed。而且 "work" 以 r 和 k 结尾，k 前面是 r，不是单独一个 a、e、i、o、u，所以 k 不双写：worked，不是 "workked"。
试一试: Last night Amina ___ to Lars on the phone. (talked / talk / talks) 答案: talked — "Last night" 说的是过去，所以要加 -ed：talked。"Talk" 和 "talks" 都是现在时的形式。
-ed 的读音：/t/ /d/ /ɪd/
过去式的词尾写出来是 e 加 d，有时只加 -d，有时还要双写字母，前面几张卡片都讲过。但它的读法并不总是一样。在 k, p, f, s, x, sh, ch 这些音后面，它听起来像 t。在 t 或 d 后面，它会多出一拍，读成 id，要读 want-id、need-id。在其他大多数音后面，它听起来像 d。
worked · washed · helped → the ending sounds like t
wanted · needed → one beat more: want-id, need-id
lived · called · cleaned → the ending sounds like d