英语词汇more about a an的意思、翻译、用法及例句-英语用法大全

Contents overview

more about a / an137 more about a/an1countable and uncountable nounsCountable nouns are the names of separate objects, people, ideas, etc which we can count.a cat – three catsa secretary – four secretariesa plan – two plansUncountable nouns are the names of materials, liquids and other things which we do not usually see as separate objects.wool (but not a wool, two wools)water (but not a water, three waters)weather (but not a weather, four weathers)energy (but not an energy, several energies)For more detailed information, 119–120.2a/an with singular countable nounsWe normally use a/an only with singular countable nouns.a secretaryan officebut not a salt or an officesFor expressions like a good two hours, 130.7.3uses of a/anA/an does not add much to the meaning of a noun – it is like a weak form of 'one'. It has several common uses.aone person or thingWe can use a/an when we mention one person or thing for the first time.There's a police car outside.My brother's married to a doctor.Andy lives in an old house.bany one member of a class.We can use a/an when we talk about any one member of a class.A doctor must like people. (= any doctor)I would like to live in an old house. (= any old house)cclassifying and definingWe can use a/an when we classify or define people and things – when we say what they are, what job they do, or what they are used for.She's a doctor.I'm looking forward to being a grandmother.A glider is a plane with no engine.Don't use your plate as an ashtray.ddescriptionsA/an is common before nouns that are used in descriptions.She's a nice person.He's got a friendly face.That was a lovely evening.It's an extremely hot day.4when a/an cannot be left outWe do not normally leave out a/an in negative expressions, after prepositions or after fractions.'Lend me your pen.''I haven't got a pen.' (not I haven't got pen.)You shouldn't go out without a coat. (not … without coat.)three-quarters of a pound (not three-quarters of pound)And we do not leave out a/an when we say what jobs people have, or how things are used (see above).She's an engineer. (not She's engineer.)I used my shoe as a hammer. (not … as hammer.)5when a/an is not used: adjectives alone; possessivesA/an cannot normally be used with an adjective alone (without a noun). Compare:It's a good car.It's good. (not It's a good.)A/an cannot be used together with a possessive. Instead, we can use the structure a … of mine/yours, etc (177).He's a friend of mine. (not He's a my friend.)6a/an and theInstead of a/an, we use the when we want to say 'You and I both know which one I mean'. Compare:She lives in a big house. (The hearer doesn't know which one.)She lives in the big house over there. (The hearer knows which one.)For details, 136.7a and an: the differenceWe do not normally pronounce the sound /ə/ before a vowel. So before a vowel, the article a (/ə/

) changes to an (/ən/

). Compare:a rabbit

a lemon

an elephant

an orange

The choice between a and an depends on pronunciation, not spelling. We use an before a vowel sound, even if it is written as a consonant.an hour /ən ˈaʊə(r)/

an MP /ən em ˈpiː/

And we use a before a consonant sound, even if it is written as a vowel.a university /ə juːnɪˈvɜːsəti/

a one-pound coin /ə ˌwʌn ˌpaʊnd ˈkɔɪn/

Some people say an, not a, before words beginning with h if the first syllable is unstressed.an hotel (a hotel is more common)an historic occasion (a historic … is more common)an hypothesis (a hypothesis is more common)but not an housewife – the first syllable is stressed.A is sometimes pronounced /eɪ/

before a hesitation, when we want to emphasise the following word, or when we want to make a contrast with the.I think I'll have a /eɪ/ – chocolate ice cream.

It's a /eɪ/ reason – it's not the only reason.

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词组	more about a an
释义	Contents overview more about a / anDeterminers: a/an and the; my, your, etc; this, that, etc137 more about a/an1countable and uncountable nounsCountable nouns are the names of separate objects, people, ideas, etc which we can count.a cat – three catsa secretary – four secretariesa plan – two plansUncountable nouns are the names of materials, liquids and other things which we do not usually see as separate objects.wool (but not a wool, two wools)water (but not a water, three waters)weather (but not a weather, four weathers)energy (but not an energy, several energies)For more detailed information, 119–120.2a/an with singular countable nounsWe normally use a/an only with singular countable nouns.a secretaryan officebut not a salt or an officesFor expressions like a good two hours, 130.7.3uses of a/anA/an does not add much to the meaning of a noun – it is like a weak form of 'one'. It has several common uses.aone person or thingWe can use a/an when we mention one person or thing for the first time.There's a police car outside.My brother's married to a doctor.Andy lives in an old house.bany one member of a class.We can use a/an when we talk about any one member of a class.A doctor must like people. (= any doctor)I would like to live in an old house. (= any old house)cclassifying and definingWe can use a/an when we classify or define people and things – when we say what they are, what job they do, or what they are used for.She's a doctor.I'm looking forward to being a grandmother.A glider is a plane with no engine.Don't use your plate as an ashtray.ddescriptionsA/an is common before nouns that are used in descriptions.She's a nice person.He's got a friendly face.That was a lovely evening.It's an extremely hot day.4when a/an cannot be left outWe do not normally leave out a/an in negative expressions, after prepositions or after fractions.'Lend me your pen.''I haven't got a pen.' (not I haven't got pen.)You shouldn't go out without a coat. (not … without coat.)three-quarters of a pound (not three-quarters of pound)And we do not leave out a/an when we say what jobs people have, or how things are used (see above).She's an engineer. (not She's engineer.)I used my shoe as a hammer. (not … as hammer.)5when a/an is not used: adjectives alone; possessivesA/an cannot normally be used with an adjective alone (without a noun). Compare:It's a good car.It's good. (not It's a good.)A/an cannot be used together with a possessive. Instead, we can use the structure a … of mine/yours, etc (177).He's a friend of mine. (not He's a my friend.)6a/an and theInstead of a/an, we use the when we want to say 'You and I both know which one I mean'. Compare:She lives in a big house. (The hearer doesn't know which one.)She lives in the big house over there. (The hearer knows which one.)For details, 136.7a and an: the differenceWe do not normally pronounce the sound /ə/ before a vowel. So before a vowel, the article a (/ə/ ) changes to an (/ən/ ). Compare:a rabbit a lemon an elephant an orange The choice between a and an depends on pronunciation, not spelling. We use an before a vowel sound, even if it is written as a consonant.an hour /ən ˈaʊə(r)/ an MP /ən em ˈpiː/ And we use a before a consonant sound, even if it is written as a vowel.a university /ə juːnɪˈvɜːsəti/ a one-pound coin /ə ˌwʌn ˌpaʊnd ˈkɔɪn/ Some people say an, not a, before words beginning with h if the first syllable is unstressed.an hotel (a hotel is more common)an historic occasion (a historic … is more common)an hypothesis (a hypothesis is more common)but not an housewife – the first syllable is stressed.A is sometimes pronounced /eɪ/ before a hesitation, when we want to emphasise the following word, or when we want to make a contrast with the.I think I'll have a /eɪ/ – chocolate ice cream. It's a /eɪ/ reason – it's not the only reason. Previous Next
随便看	so so so so that so that and in order that sound south south and southern etc southern etc so with say so with say and tell speak speak and talk specially special plurals special rules special rules and exceptions special structures with past tenses special structures with past tenses and would speech speech and spoken exchanges introduction spelling spelling and pronunciation spelling introduction spelling of plurals spoken exchanges introduction spoken sentence structure