这3个动词，情况各不相同，正误如下：

1. get + 宾语 + to do （正）

2. leave + 宾语 + to do （正）

3. keep + 宾语 + to do （误）   

改为：keep + 宾语 + doing

【小结】作get，leave 宾补的不定式不可省略to；而keep 的宾补不可以是不定式。

   作get，leave 宾补的不定式必须带to；keep 的宾补不能用不定式，可以用 doing 形式。例如：

    He got his sister to help him with his homework. 他让姐姐帮助他做家庭作业。（摘自《牛津高阶英汉双解词典》第9版）

    Leave the rice to cook for 20 minutes. 把大米煮20分钟。（摘自《牛津高阶英汉双解词典》第9版）

    I'm very sorry to keep you waiting. 对不起，让你久等了。（摘自《牛津高阶英汉双解词典》第9版）

使役动词get、leave、keep，不定式作宾语补足语的时候，用不用省略to？

以上4个动词，只有get/leave后面可以接不定式“to do”作宾语补足语,keep补可以。以上3个都可以接形容词，过去分词作宾语补足语。

A: get 后面可以接以下几种不同宾补

(1)不定式（即get sb to do）

We got mother to prepare our lunch.
我们说服母亲去准备午餐。

They wanted to get the workers to call off the strike.
他们想让工人们取消这次罢工。

We've got you to thank for all the mess we are in.
我们的处境弄得这样糟你是有责任的

(2)现在分词（即get sth doing）

Can you get that electric toy working?
你能使那个电动玩具动吗?

I shall soon get the machine working.
我很快就会让机器运转起来的。

Can you get the clock going?
你能让钟走起来吗?

(3)过去分词（即get sth done）

I must get my hair cut.
我必须去理发。

I've already got the dinner cooked.
我已做好了晚饭。

They got a photograph taken together in front of the leaning tower.
他们一起在斜塔前照了一张相。

(4)过去分词（即get sth +adj./adv.）

How did the boy get himself dirty?
这孩子怎么搞得这么脏?

The boy got his clothes all wet.
这男孩把衣服都弄湿了。

He got all the answers wrong.
他把所有的答案都搞错了。

(5)过去分词（即get sth +介词短语）

I'll soon get everything in good order.
我很快就会把一切安排得有条不紊。

The doctor got me on the diet, the pest under control.
医生让我节食,这病得到了控制。

B: keep 后面可以接以下几种不同宾补

(1)名词

They kept him a prisoner.
他们把他监禁起来。

That kept him a student.
那使他继续当学生。

(2)副词

What keeps you here so late?
什么使你在这里呆得这么晚?

(3)现在分词

They kept her working all day.
他们强迫她整日工作。

Keep the fire burning, will you?
让火一直着着，好吗?

The police keep the traffic moving.
警察使交通畅通无阻。

(4)过去分词

She keeps the food locked up.
她把食品锁起来了。

Hereafter， I want you to keep me informed of how things are going with you.
从此以后,我要求你让我了解你的进展情况。

His friend kept him pinned to the floor until he took back the insult.
他的朋友把他牢牢按在地板上,要他收回他的侮辱性言词。

C: leave 后面可以接以下几种不同宾补

(1)形容词

He said he had left the door open on purpose.
他说他是有意让门开着的。

We can leave it open for the moment.
这事我们可暂时不作结论。

(2)不定式

Leave him to do it himself.
让他自个儿去做。

We must leave the children to settle their affairs themselves.
我们必须让孩子自己解决自己的事情。

I'll leave you to settle all the business.
我让你去处理所有事务。

He left me waiting outside in the rain.
他让我站在雨里等候。

(3)现在分词

Why did you leave the guests standing there?

你为什么让客人站在那儿?

They walked off and left me sitting there all by myself.
他们走了,让我孤零零一个人坐在那里。

(4)过去分词

They could not leave the city unguarded.
他们不能让这座城市不设防。

I'm sorry I've left some of your questions unanswered.
很抱歉,你的一些问题我没有回答。

But a day's talk left them still divided on some issues.
讨论了一天,但在有些问题上,他们的意见还有分歧。