1.有些表示意愿、能力、可能性或倾向的形容词（如apt,eager, certain, hesitant, liable, likely, reluctant, sure, welcome等）后不定式的逻辑主语就是句子主语，如：
Babies are apt to put objects into their mouths.
婴儿爱把东西往嘴里塞。
She was apt to raise her voice and wave her hands about...
她动不动就拔高嗓门，并挥舞双手。
The boy is apt to learn. 这个男孩善于学习。
Jack is apt to be impulsive.
杰克易于冲动。
The British prime minister is too apt to cling to Washington's apron strings.
英国首相对华府过于唯命是从。
This kind of apple is apt to go bad.
这种苹果容易坏。
Iron is apt to rust.
铁容易生锈。
People are apt to confuse the two issues.
人们容易把这两个问题混淆起来。
As things stand at present, he seems certain to win.
据目前情况看，他似乎胜券在握。
They are certain to agree.
他们肯定会同意。
If they followed the road, they would be certain to reach a village.
如果他们沿着这条路走，就一定会到达一个村庄。
Mr King seems certain to be pressed for further details.
看来人们一定会竭力要求金先生提供进一步的细节。
The United States is certain to reject the proposal as a non-starter.
美国肯定会以无成功希望为由拒绝这项提案。
The President and his supporters are almost certain to read this vote as a mandate for continued economic reform.
总统及其支持者几乎肯定地认为这次投票是对继续进行经济改革的授权。
John Wakeham seems certain to become the fixer the Prime Minister will need at election time.
约翰·韦克厄姆似乎必定会成为首相竞选时所需要的问题化解高手。
His opinion is certain to carry weight.
他的意见一定会受到重视。
Doctors are hesitant to comment on the new treatment.
医生们不愿对新疗法作出评论。
His advisers are rightfully hesitant to let the United States be sucked into the conflict.
他的顾问们都理所当然地有所犹豫，不愿让美国卷入冲突之中。
Many witnesses are still hesitant to come forward.
许多目击者仍然不愿意站出来。
He was eager to communicate his ideas to the group.
他急于把他的想法传达给小组。
The company is eager to gain a foothold in Europe.
这家公司急于在欧洲取得一席之地。
As soon as we arrived on the island we were eager to explore.
我们一来到岛上就急不可耐地开始探胜。
They're eager to please.
他们竭力讨好卖乖。
Robert was eager to talk about life in the Army.
罗伯特很想谈谈陆军生活。
He was eager to get into politics.
他渴望进入政界。
She sounded less and less eager to return to Ireland.
听她话音，她回爱尔兰的热情似乎日渐消退。
Parliamentarians were eager to turn over responsibility for the decision.
经验老到的议员急于把作决策的责任推卸给他人。
The other banks are going to be very eager to help, provided that they see that he has a specific plan.
如果看到他有具体的计划，其他银行会很愿意提供帮助。
Politicians are eager to promote their 'happy family' image to curry favour with voters.
政客们极力宣传他们的“幸福家庭”形象以讨好选民。
You're so eager to stay in the good graces of the King that nothing else matters to you.
你如此急于博得国王的欢心，以致其他事情都不管不顾了。
They are eager to confront their guests with full frontal interrogations about their marriages.
他们急于当面直接质问客人的婚姻情况。
They are eager to buy their government bonds.
他们热心购买政府债券。
Our company is eager to expand into new markets.
我们公司急欲开辟新的市场。
He is liable to abrupt mood swings.
他的情绪易于大起大落。
The bridge is liable to collapse at any moment.
那座桥随时可能坍塌。
Offenders will be liable to a heavy fine.
违者须付巨额罚金。
Educational practice is liable to sudden swings and changes.
教学实践中经常会出现突然的变化与改革。
Only a small minority of the mentally ill are liable to harm themselves or others.
在精神病患者中，只有一小部分有可能会伤害自己或他人。
Offenders will be liable to a seven-year prison term.
违犯者可判处7年监禁。
He is liable to catch a cold.
他易患感冒。
The dog is liable to bite when angry.
这只狗生气时容易咬人。
This area is liable to flooding.
该地区易遭受水灾。
This decision is likely to upset a lot of people.
这项决定很可能会使许多人不快。
The report is likely to prove highly embarrassing to the government.
这份报告可能会让政府非常尴尬。
The allegations are likely to damage his political career.
这些指控有可能伤及他的政治生涯。
The closure of the factory is likely to cost 1 000 jobs.
那家工厂一关闭，很可能1000个工作岗位就没有了。
They aren't likely to arrive this side of midnight.
午夜之前他们不大可能赶到。
He is hardly likely to admit he was wrong.
他不大可能承认自己错了。
Tickets are likely to be expensive.
入场券可能很贵。
Train fares are likely to remain unchanged.
火车票价很可能会保持不变。
He is likely to get off with a small fine.
他可能会逃脱严惩，仅仅罚一点钱了事。
Unemployment is likely to go on rising this year.
今年的失业人数可能会继续上升。
You are likely to find many people who have stereotyped ideas about women.
你很可能会发现很多人对女性都抱有老一套的看法。
I was reluctant to embroil myself in his problems.
我不愿意卷入到他的问题中去。
She was reluctant to confess her ignorance.
她不愿意承认自己无知。
She's reluctant to take all the credit.
她不愿接受所有荣誉。
She was reluctant to admit she was wrong.
她不愿承认自己有错。
She is reluctant to discuss the content of the play.
她不愿意谈该剧的内容。
People have been reluctant to make formal complaints to the police.
人们不愿向警方作出正式投诉。
Japan has been reluctant to offer much aid to Russia.
日本一直不愿意向俄罗斯提供太多的援助。
The police are very reluctant to get involved in this sort of thing.
警方很不愿意卷入这类事情。
Criminals are very reluctant to leave a paper trail.
罪犯非常不愿意留下案底。
Everyone is more reluctant to travel these days, not least the Americans.
这段时间大家都减少了出游的*，美国人尤其如此。
Trish was silent because she was reluctant to put her thoughts into words.
特里西一直不说话，因为她不愿意吐露内心的想法。
Mr Spero was reluctant to ask for help.
斯佩罗先生不愿意寻求帮助。
They have been reluctant to admit AIDS patients, in part because of unfounded fears of contagion.
他们一直不愿接纳艾滋病患者，部分原因是无来由地害怕被接触传染。
He was reluctant to mention his past experiences.
他不愿意提及过去的经历。
She's sure to be picked for the team.
她肯定会入选该队。
A bad result is sure to throw a spanner in the works.
糟糕的成绩肯定会坏事的。
They are sure to win this basketball match.
他们肯定能打赢这场篮球赛。
This year's harvest is sure to be good.
今年的收成错不了。
They're welcome to stay here as long as they like.
他们在这里愿意住多久就住多久。
You're welcome to stay the night here.
欢迎你在这里留宿。
You are welcome to come and stay as long as you give us plenty of notice.
只要你及时通知，我们都欢迎你来住宿。
Non-resident guests are welcome to use the hotel swimming pool.
欢迎非旅馆住客使用本旅馆的游泳池。
You are welcome to come in and browse.
欢迎您光临本店随便看看。
You're welcome to stay to supper, but you'll have to take pot luck..
欢迎你留下来吃晚饭，不过你得有什么就吃什么了。
You are welcome to visit the hospital at any time.
你可以随时来医院参观访问。
Church leaders said he was welcome to return.
教会领袖说欢迎他回来。
There's a big press launch today and you're most welcome to come along.
今天有一个大型的媒体推介会，非常希望您能光临。
Customers are welcome to linger over coffee until around midnight.
客人尽可以喝着咖啡逗留到午夜左右。
You are welcome to vary the diet.
我们鼓励不时变换饮食。
You are welcome to put forward your views.
诸位有什么意见，欢迎提出来。
You are welcome to use my library.
你可以随便使用我的藏书。
2.有些形容词，如sufficient ,available, ready, free, fit等，其后的主动形式的动词不定式，既可表达主动意义，又可表达被动含义：
This is sufficient to show that his argument is false.
这足以证明他的论点是错误的。
These reasons are not sufficient to justify the ban.
这些理由不足以证明实施禁令有理。
His plan for tax relief is fine as far as it goes but will not be sufficient to get the economy moving again.
他的减税方案还算不错，但并不足以促使经济再次发展。
Our savings are sufficient to buy a new car.
我们的储蓄足够买一辆新车。
Is there available to replace her?
有没有什么人来替代她？
The cups are available to use/to be used.
这些杯子可供使用。
You are free to come and go as you please.
你来去自由。
Your car isn't fit to be on the road!
你的车子还不适合上马路！
He won't be fit to play in the match on Saturday.
他身体不适，不能在星期六出场比赛。
You're not fit to be a mother!
你不配做母亲！
The stink was fit to knock you down.
这臭味简直要把人熏倒。
He is not fit to preside over this meeting.
他不适合主持这次会议。
The water is not fit to drink.
这水不适宜饮用。
He is physically fit to be an airman.
他身体很好适于当飞行员。
He is not fit to be a teacher.
他不适合当教师。
The dried grain is fit to store( to be stored).晒*谷物适于储存。
They are free to do as they please.
他们想怎么做就怎么做。
He was free to marry whomever he chose.
他看上了谁就可以和谁结婚。
The government will be free to pursue its economic policies.
政府将可不受限制地实行其经济政策。
Women should be free to dress and act as they please.
女性应该有穿衣和行动的自由。
People should be free to express their individuality.
人们应该能自由表达他们的个性。
Grandmother felt free to order her about just as she wished.
奶奶毫不客气地随意支使她。
The government is ready to introduce protection for the car industry.
政府准备对汽车工业实行贸易保护。
He's always ready to help his friends.
他总是乐意帮助朋友。
Our representatives are ready to help you at all times.
我们的代表随时准备帮助你。
You must be ready to leave at a moment's notice.
你必须随时准备出发。
I am now ready to answer your questions.
我现在可以回答你们的问题了。
The article is ready to publish, subject to your approval.
那篇文章准备好了，可以发表，就等你批准了。
最后试比较：
The lamb is ready to eat.
小羊准备吃食。（不定式表示主动意义）
羔羊肉准备好了，可以吃了。（不定式表示被动意义）
