My kids are watching TV when I get home. 我回家时，孩子们正在看电视。

(1) 主语改为 She 开头的过去时

—> She was watching TV when I got home. 我回家时，她正在看电视。

(2) 改为将来进行时的句子

—> My kids will be watching TV when I get home. 我回家时，孩子们会是在看电视。

(3) 改为用 What 开头的过去进行时疑问句

—> What were my kids doing when I got home? 我回家时，孩子们在做什么？

 I turn off the light. 我关灯。/ 我熄灯。

(1) 改为过去时否定句
—> I didn't turn off the light. 我没熄灯。

(2) 改为以 you 为主语的过去时疑问句
—> Did you turn off the light? 你熄灯了吗？

(3) 改为以 I wonder if 开头的句子
—> I wonder if I turn off the light. 我有没有关灯？

My son goes to cram school every evening. 我儿子每天晚上都去上补习班。

(1) 主语改为复数
—> My sons go to cram school every evening. 我的儿子们每天晚上都去上补习班。

(2) 改为 You 为主语的附加疑问句
—> You go to cram school every evening, don't you? 你是每天晚上去补习班吗？/ 你每天晚上去补习班，是吗？ 

(3) 主语改为 you 并改为表示“一星期多少次……”为开头的疑问句 （问“多少次”的疑问句可以 How often...? How many times...? 的句型）
—> How often do you go to cram school a week? 
      How many times do you go to cram school a week? 你一个星期去多少次补习班？

The children are playing cards in the living room. 孩子们在客厅玩扑克牌。

(1) 改为过去时的疑问句
—> Were the children playing cards in the living room? （过去的某个时间段）孩子们在客厅玩扑克牌吗？

(2) 句子开头加 I think “我想……，我认为……”
—> I think the children are playing cards in the living room. 我想孩子们正在客厅玩扑克牌。

(3) 改为用 may 表示的“也许……，可能……”的句子
—> The children may be playing cards in the living room. 孩子们也许正在客厅玩扑克牌。

My wife opens the door for me. 我太太为我开门。

(1) 主语改为 You
—> You open the door for me.你为我开门。

(2) 改为进行时
—> My wife is opening the door for me. 我太太正在为我开门。

(3) 改为 Could you...?“你能……”的疑问句
—> Could you open the door for me? 你能为我开门吗？

Dad is sleeping on the couch. 爸爸正在长椅上睡觉。

(1) 主语改为 You
—> You are sleeping on the couch. 你正在长椅上睡觉。

(2) 改为 Don't...开头的否定句来表示“不可以”“别……”
—> Don't sleep on the couch. 别在长椅上睡觉。

(3) 改为用 must 来表示“应该睡在长椅上呢吧”表示推测之意的句子
—> Dad must be sleeping on the couch. 爸爸应该是正在长椅上睡觉。

I do aerobics. 我做有氧运动。

(1) 改为以 You 为主语的现在完成时疑问句
—> Have you ever done aerobics? 你做有氧运动了？

(2) 改为“我从没……” never
—> I've never done aerobics. 我从没做过有氧运动。

(3) 改为以 She 为主语的过去进行时
—> She was doing aerobics. （过去的某个时间段）她正在做有氧运动。

Someone is walking behind me. 有人走在我后面。

(1) 改为以 No one 为主语的句子

—> No one is walking behind me. 没人走在我后面。

(2) 改为以 Who 开头的疑问句

—> Who is walking behind me? 谁走在我后面？

(3) 改为以 Do you think 开头的疑问句

—> Do you think someone is walking behind me? 你觉得有人走在我后面吗？

I applaud the performance. 我为演出鼓掌喝彩。

(1) 改为以 She 为主语的现在进行时
—> She is applauding the performance. 她为演出鼓掌喝彩。

(2) 改为以 they 为主语的过去时疑问句
—> Did they applaud the performance? 他们为演出鼓掌喝彩了吗？

(3) 改为以 You 为主语，并且以 Why 开头的过去时疑问句
—> Why did you applaud the performance? 你为什么为演出鼓掌喝彩？

I eat noodles at the noodle restaurant. 我在面馆吃面。

(1) 改为以 We 为主语的将来时
—> We will eat noodles at the noodle restaurant. 我们要在面馆吃面。

(2) 改为以 Let's 为主语
—> Let's eat noodles at the noodle restaurant. 我们在面馆吃面吧。

(3) 改为以 You 为主语的过去时疑问句
—> Did you eat noodles at the restaurant? 你在饭馆吃面了吗？

—> Did you eat noodles at the noodle restaurant? 你在面馆吃面了吗？

I take a shot of whiskey. 我喝一杯威士忌。

(1) 改为现在进行时

—> I'm taking a shot of whiskey. 我正在喝杯威士忌。

(2) 改为以 She 为主语的疑问句

—> Does she take a shot of whiskey? 她要喝一杯威士忌吗？

(3) 改为“喝了三杯”

—> I took three shots of whiskey. 我喝了三杯威士忌。

She stops at the supermarket on the way home. 她在回家途中顺道上超市。

(1) 改为过去时否定句

—> She didn't stop at the supermarket on the way home. 她在回家途中没有顺道去超市。

(2) 将动词改为 have to...“应该……”

—> She has to stop at the supermarket on the way home. 她回家的途中应该去趟超市。

(3) 改为以 Where 开头，并且用 be going to 的将来时疑问句

—> Where is she going to stop on the way home? 她回家途中顺道要去哪儿？

This knife cuts very well. 这把刀很锋利。

(1) 改为否定句
—> This knife doesn't cut very well. 这把刀不太锋利。

(2) 改为“这把刀根本没办法切东西”
—> This knife doesn't cut at all.（句型 not...at all 表示“根本不……”）

(3) 改为 Do you think...? “不认为”开头的疑问句
—> Do you think this knife cuts very well? 你觉得这把刀锋利吗？

ABC department store is having a sale this week. ABC百货公司这星期正在大减价。

(1) this week 改为 last week
—> ABC department store had a sale last week. ABC百货公司上星期大减价了。

(2) 改为疑问句
—> Is ABC department store having a sale this week? ABC百货公司这星期正在大减价吗？

(3) 改为以 when 为开头的将来时疑问句
—> When will ABC department store have a sale? ABC百货公司什么时候大减价？

The bank closes at 3:00 p.m. 银行在3点关门。

(1) 改成以“什么时候” When 开头的疑问句
—> When does the bank close? 银行什么时候关门？

(2) 改成附加疑问句
—> The bank closes at 3:00 p.m., doesn't it? 银行在3点关门是吗？ 

(3) 改为用 cannot “不可能……”和 2:00 p.m.“2点钟”表示“银行不可能在2点关门。”
—> The bank cannot close at 2:00 p.m.

I stand in line at the cash register. 我在收银台排队。

(1) 改为过去时

—> I stood in line at the cash register. 我在收银台排队了。（stand“站”的过去时是 stood）

(2) 改为以 she 为主语的过去时疑问句

—> Did she stand in line at the cash register? 她在收银台排队了吗？

(3) 改为现在完成进行时 have been doing，并加上 for twenty minutes 表示“我在收银台前排了20分钟队。”

—> I have been standing in line at the cash register for twenty minutes.

I throw away the garbage. 我丢垃圾。

(1) 改成以 He 为主语的过去时
—> He threw away the garbage. 他丢垃圾。（throw 的过去式是 threw）

(2) 加上 yesterday 并改为否定句
—> I didn't throw away the garbage yesterday. 昨天我没有丢垃圾。

(3) 以 he 为主语，并在句子前面加上 I saw
—> I saw him throw away the garbage. 我看见他丢垃圾

I change the baby's diaper. 换婴儿尿布。

(1) 改为以 she 为主语的过去时疑问句
—> Did she change the baby's diaper? 她给婴儿换尿布了吗？

(2) 主语改为 she，并以“多少次”为开头的疑问句
—> How many times a day does she change the baby's diaper? 她一天换多少次婴儿尿布？

(3) 改为以 she 为主语，并且加上“2小时以前”
—> She changed the baby's diaper two hours ago. 她2小时以前给婴儿换过尿布。

The meeting went well. 会议进行得很顺利。

(1) 句子开头加上 I hope...“我希望……”，提示: 时态用将来时
—> I hope the meeting will go well. 我希望会议进行顺利。

(2) 句子开头加上 He said...“他说……”
—> He said the meeting went well. 他说会议进行得很顺利。

(3) 句子开头加上 I wish...“希望……”，提示: 时态用过去完成时（表示与过去事实相反的愿望）
—> I wish the meeting had gone well. 希望/愿会议进行得顺利。

Somebody tripped over the cord. 有人被电线绊倒了。

(1) 改为以 Who 开头的疑问句
—> Who tripped over the cord? 谁被电线绊倒了？

(2) 用 must “一定是……”造句
—> Somebody must have tripped over the cord. 一定是有人被电线绊倒了。 （“一定是……”用 must + have + 过去分词来表达）

(3) 改为以 She 为主句的过去时附加疑问句
—> She tripped over the cord, didn't she? 她被电线绊倒了是吗？