Grammar教学实录与评析

A BrE /ə/ indefinite article The form a is used before consonant sounds and the form an before vowel sounds. When saying abbreviations like ‘FM’ or ‘UN’, use a or an according to how the first letter is said. For example, F is a consonant, but begins with the sound /e/ and so you say:an FM a vowel but begins with /j/ and so you say:a UN declaration. 1.used before countable or singular nouns referring to people or things that have not already been mentioned a man/horse/unit

an aunt/egg/hour/X-ray

I can only carry two at a time.There's a visitor for you.

She's a friend of my father's (= one of my father's friends).

2.used before uncountable nouns when these have an adjective in front of them, or phrase following them a good knowledge of French

a sadness that won’t go away

3.any; every A lion is a dangerous animal. 4.used to show that somebody/something is a member of a group or profession Their new car's a BMW. She's a Buddhist.

He's a teacher. Is that a Monet (= a painting by Monet)? 5.used in front of two nouns that are seen as a single unit a knife and fork 6.used instead of one before some numbers A thousand people were there. 7.used when talking about prices, quantities and rates They cost 50p a kilo. I can type 50 words a minute. He was driving at 50 miles an hour. 8.a person like somebody She's a little Hitler. 9.used before somebody’s name to show that the speaker does not know the person There's a Mrs Green to see you. 10.used before the names of days of the week to talk about one particular day She died on a Tuesday.