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(1)
Would, could and might have special meanings.
Requests and offers: We use would to make requests more tentative or polite.
Would you fill in this form, sir?
Would you like a cup of coffee?
Disagreeing: We can use would/wouldn’t to show disagreement in a polite way.
I wouldn’t go that far.
Expressing desires
I would like to stay in five-star hotels. (I don’t stay in them, but it is my desire).
We use “can“ to describe things which are generally possible. To talk about specific possibilities we use may, might and could (but not "can". The meaning is similar to ‘perhaps’ or ‘may be’.
The rash could be a symptom of something more serious.
He always wears smart suits. He could be a businessman.
Could I see you for a few minute? (permission)
Well, you could/might take some tutorial classes. (suggestion)
We also use would, could, might in second conditional sentence. We are talking about something unreal, unlikely or untrue. We are talking about the situation now, and not in the past.
If I were a millionaire, I would travel round the world.
If I had a light, I could see what I'm doing.
(If + past simple, would + verb …)
(2)
The –ing form of the verb has two uses.
(I) With be, it makes the progressive form of the verb phrase. (is eating, was playing).
(II) Without be, it form the present participle, which is the first word of an –ing clause
Use verb-ing when you need a verb after a preposition.
The headmaster insists on seeing you.
All the people who ate in the restaurants were tourists.
All the people eating in the restaurants were tourists. (without the use of relative pronoun ‘who”)
The waiter brought a dish. The dish contained a delicious soup.
The waiter brought a dish containing a delicious soup. (one sentence)
We walked along the street. We saw an accident.
Walking along the street, we saw an accident. (one sentence)
A gerund is sometimes refers to as an –ing form, but not all –ing forms are gerunds. A gerund is used as a noun.
Jogging isn’t my idea of fun.
2011-12-27 07:29:33 補充:
The following verbs can be followed by a “verb-ing”.
admit, avoid, consider, deny, dislike, enjoy, fancy, finish, involve, keep,
mind, miss, postpone, recall, resent, resist, risk, suggest
They enjoy working together.
Do you mind opening the window?
You must keep trying.
I miss working with you.
參考: Longman English Grammar and Usage