(1) prone意为“常可能(做某事)；容易(做某事、出现某种情况)”，这种事或情况通常是不好的，常与to连用，后面可接不定式、名词或动名词。
- Old people are prone to loss of memory/to losing their memory/to lose their memory.
老年人常出现记忆衰退的现象。 - One is more prone to make mistakes when one is tired.
人在疲劳时易出错。 - We are prone to think evil of people we don't like.
我们对我们不喜欢的人常往坏处想。
＊prone to常与accidents, error, sudden fits of temper, anger, idleness, superstition, disease等词连用。
（拓展学习：小词详解 | prone）
(2) ①liable意为“(由于性质、性情、习惯或倾向)常会、容易(做某事或出现某种情况)”，这种事或情况通常是不好的，常与介词to连用，也可接不定式，与prone to常可换用。
- She is liable to bad colds/to catch cold.
她易患感冒。 - Children are liable to run away if strangers speak to them.
如果陌生人跟小孩子说话，他们总爱跑开。 - Products of plastics are liable to catch fire.
塑料产品容易着火。 - We're all liable/prone to make mistakes occasionally.
我们都容易偶尔犯错误。 - Her family are liable to obesity.
她的家人很容易发胖。
②liable to有时表示“可能会受到(惩罚等)”。
- If you drive a car to the danger of the public, you make yourself liable to a heavy fine, or even to imprisonment.
如果你开车给公众造成危险，你将会受到重罚，甚至被监禁。 - People who walk on the grass are liable to a fine of $5/to a fine not exceeding $5.
践踏草坪会受到5美元的罚款/不超过5美元的罚款。
③liable可作“对……负责”解，与介词for连用。
- You should be liable for all the damage done by your workmen.
你应对你的工人造成的损失负责。 - You're liable for his debts since you stand guarantee for him.
既然你为他担保，就要为他的债务负责。
（拓展学习：一词多义 | liable）
(3) ①apt意为“容易……；常会……”，指由于性质或天性常会做某事，容易出现某种情况或倾向，后面接不定式。
- This kind of shoe is apt to slip on wet ground.
这种鞋子在湿地上容易打滑。 - The weather is apt to be very hot in Jinan in summer.
济南的夏天天气往往非常炎热。 - That dog is apt to bite if he is teased.
那只狗如果被逗弄很容易咬人。
②apt有时作“很可能”解，等于likely。
- The shop is apt to be closed.
这家商店很可能关门。
(4) inclined常用作表语，表示“倾向于……；感到想……；常常……”，多指主观上的倾向，一般用于人，常接不定式、介词to，有时接介词for。
- I don't feel specially inclined to spend my holidays there.
我并不特别想在那里度假。 - I'm inclined to think the plan is somewhat impractical.
我倾向于认为那个计划有些不现实。 - He had been inclined to talkativeness, but gradually he became silent.
他曾一度很健谈，但渐渐地变得沉默起来。
(5) ①susceptible意为“易感受……的；敏感的；易受……感动的；易受……影响的；易受到……的”；常与介词to连用，如：susceptible to flattery/kind
treatment/a woman's tears/colds等。
A vague law is always susceptible to differing interpretations.
模糊不清的法律容易有不同解释。
②be susceptible of意为“能……的；容许……的”。
- The sentence is susceptible of two interpretations.
这个句子可有两种解释。 - Is your statement susceptible of proof?
你的话有证据吗？ - A signed contract is not susceptible of change.
已签订的合同是不容更改的。
(关于susceptible，另见“sensible of，...”条。)
(6) subject用作形容词时，常与介词to连用，表示：
①“受……制约，受……约束”。
- Wherever you are, you have to be subject to the rules and regulations of the company you belong to.
不管你在哪里，都必须受到所在公司规章制度的约束。
②“在……条件下；须经……；尚待……；取决于……”。
- You can have a try again subject to the manager's approval.
在经理同意的条件下，你可以再试一次。 - Subject to your consent, I propose to start the project a month earlier.
只要你同意，我提议提前一个月开工。 - The plan is made subject to the manager's approval.
计划已经制订，尚待经理批准。 - We may set out on our journey tomorrow morning, subject to the weather.
如果天气允许的话，我们可能在明天早晨出发。
③“易(遭)受，易发生，常有，得经常忍受，可能会(需要)”，在此意义上可与prone, liable, susceptible换用，但只后接介词to，与名词连用。
- Are you subject to colds in winter?
你冬天常患感冒吗？ - The trains are subject to delays when there is fog.
雾天火车常常晚点。 - Japan is subject to earthquakes.
日本常常有地震。 - He is a very good man except that he is subject to (violent) fits of temper.
他是一个好人，只是爱发脾气。 - The times of all trains are subject to alteration.
所有列车时刻都可能会有变动。
