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M. Accustomed, afraid, ashamed, certain, interested, sorry, sure, used

  1. accustomed

Both structures to be accustomed + infinitive and to be accustomed + -ing are possible with little difference of meaning:

She is accustomed to walk/to walking home in any weather.

  1. afraid be afraid + infinitive means that the subject is too frightened to perform the action and he won’t do it:

He is afraid to climb the tree.

(=He doesn’t want to climb the tree because he is afraid) be afraid + -ing means that we are afraid of bad things that may happen unexpectedly. We do not use this structure for things we do intentionally: He didn’t want to tell her this news. He was afraid of making her upset.

be afraid can also be followed by a that-clause. This can express a fear: I’m afraid that this illness will ruin him, and (especially in the first person) regret: I’m afraid (that) I can’t do it in time.

  1. ashamed be ashamed + infinitive. The infinitive here usually refers to a subsequent action: I’m ashamed to tell you how much I spent. (= I don’t want to tell you.) be ashamed of + gerund or be ashamed of yourself etc. for + gerund. The gerund here refers to a previous action: I’m ashamed of shouting at you. I’m ashamed of myself for shouting at you. would be ashamed + infinitive often implies that the subject’s feelings prevent him from performing the action: I’d be ashamed to borrow money from him. (so I won’t borrow)

  2. certain, sure certain/sure + infinitive means that the subject will definitely do it: He is certain/sure to win the race. (=the other sportsmen are far worse) certain/sure + gerund means that the person feels certain or sure he will do it, but he could be wrong: Starting the experiment he was certain/sure of finding the solution, but then he began to lose confidence. In the first case we talk about what will happen, in the second we describe a person’s state of mind.

  3. interested interested in + -ing refers to what will (may) happen. It means to be interested by the idea of doing something: I’m interested in buying a house in the village. (=I’m thinking of doing it, I’d like to do it) interested + inf. refers to what has happened. The structure is usual with hear/see/know/read/learn, etc. I was interested to know that your brother got the scholarship.

  4. sorry sorry + infinitive is used when we apologize for something that we are doing or about to do. Sorry to interrupt you. I need your advice. sorry + infinitive is also used to express sympathy or regret: I’m sorry to hear that you’ve been ill. sorry for + -ing is used when we apologize for something that we have done. In this case we can also use a perfect infinitive or a that-clause: I’m sorry for ringing you up so late yesterday. I’m sorry to have rung you up so late yesterday. I’m sorry that I rang you up so late yesterday.

  5. used used + infinitive exists only in he past. It means that the subject did something regularly in the past but no longer does it: They used to spend much time together but now they do not meet very often. be used to + -ing means that something isn’t strange or new for the speaker: After living in the country for many years he is used to walking long distances.