stay.pratice. study .stop. are. have.过去式

stay——stayed

pratice——praticed

study——studied

stop——stopped

are——were

have——had

1. 直接在词尾加-ed。如: want—wanted, work—worked, need—needed, clean—cleaned

2. 以不发音的e结尾的在词尾加-d。如：like—liked, live—lived, use—used, move—moved

3. 以一个元音字母加一个辅音字母结尾的重读闭音节动词，先双写结尾的辅音字母，再加-ed。如：stop—stopped, trip—tripped

4. 以辅音字母加y结尾的动词，先把y变成i，再加-ed。如：study—studied, carry—carried, hurry—hurried, marry—married

不规则动词的过去式见课本后的不规则动词表。大体上归纳有以下六条记忆法：

1. 以t结尾的词，过去式与原形相同。如：put—put, let—let, cut—cut, beat—beat

2. 以d结尾的词，把d变成t。如:build—built, lend—lent, send—sent, spend—spent

3. 以n结尾的词，在词后加t。如：mean—meant, burn—burnt, learn—learnt

4. 以ow / aw结尾的词，把ow / aw变成ew。如：blow—blew, draw—drew, know—knew, grow—grew

5. 含有双写字母的词，将双写改为单写，在词尾加t。如：keep—kept, sleep—slept, feel—felt, smell—smelt

6. 含有元音字母o / i的词，将o / i变成a。如：sing—sang, give—gave, sit—sat, drink—drank

希望采纳O(∩_∩)O~

stay这个词可以是及物动词，也可以不及物。

及物动词时：stop, delay, postpone or check (sth) 停止, 延缓, 推迟, 控制（某事物）: stay (ie delay) punishment/judgement 延缓惩罚[审判] * stay the progress of a disease 防止病情恶化 * a little food to stay (ie temporarily satisfy) one's hunger 暂且充饥的一点食物

To remain during:

在…期间停留：stayed the week with my parents; stayed the duration of the game.那个星期和父母呆在一起；比赛一直持续

To wait for; await:

等待；等：“I will not stay thy questions. Let me go;/Or if thou follow me, do not believe/But I shall do thee mischief in the wood”(&b{Shakespeare})“我不会等你发问。让我走；/或者如果你跟着我，不相信的话/我会在林中对你捣乱”

不及物动词时：

remain or continue in the same place (for a long or short time, permanently or temporarily, as specified by the context); not depart or change 停留; 留下; 住; 在某处呆一段时间: stay (at) home, ie not go out or to work 呆在家里 * stay late at the office 在办公室呆到很晚 * I'm afraid I can't stay, ie I must leave now. 很抱歉, 我得走了. * stay in the house, in bed, in one's room, etc 呆在房子里﹑ 床上﹑ 房间里等 * stay in teaching, journalism, etc, ie not change one's job 继续教书﹑ 从事新闻工作等 * stay away from (ie not go to) school 不上学 * Stay on this road for two miles then turn left. 沿这条路走两英里, 然後向左拐. * Stay here until I come back. 我回来之前你别走. * We stayed to see what would happen. 我们留下来看进一步的发展. * I can only stay a few minutes. 我只能呆上几分钟. => Usage at and 用法见and. (b) [La, Ln] continue in a certain state 维持某状态: stay awake 不睡觉 * stay single, ie not marry 不结婚 * He never stays sober for long. 他不醉的时候不多. * They stayed friends for years. 他们的友谊维持了多年.

[I, Ipr, In/pr] remain or live somewhere temporarily, esp as a visitor or a guest 逗留, 暂住（尤指过访或作客时）: It's late why don't you stay (ie for the night)? 很晚了--你就在这儿过夜好吗? * stay in a hotel 住在旅馆里 * Why don't you come to stay with us next time you visit Durham? 下次来达勒姆就住在我们这儿好吗? * Jenny's staying in Dublin for a few days, but she now lives/is now living (ie has her home) in Belfast. 珍妮目前在都柏林小住几日, 她的家是在贝尔法斯特. * stay the night with sb, ie sleep at sb's house for the night 在某人家过夜.

stay on

(a) remain in position on top of sth 留在某物上面: My hat won't stay on properly. 我这帽子总也戴不正. (b) remain alight, burning, running, etc 保持某种活动状态（亮着﹑ 烧着﹑ 运动着...）: The TV stays on all day at this place. 这个地方的电视成天开着. stay on (at...) remain at (a place of study, employment, etc) after others have left （别人走後）留在（学习﹑ 工作等的地方）: He stayed on at university to do research. 他留在大学里做研究工作.

stay for/to sth

remain at a person's house for (a meal) 留在某人家（吃饭）: Won't you stay for/to supper? 你吃了晚饭再走好吗?

stay in

(a) not go outdoors 不出门; 呆在家里: The doctor advised me to stay in for a few days. 医生嘱我在家休息几天. (b) remain at school after others have left, esp as a punishment 课後留在学校（尤指作为惩罚）.

至于这里为什么用on,我个人认为和stay 没有关系，一般说on the days. 或者是in the days.

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