a

1. used to show that you are talking about someone or something that has not been mentioned before, or that your listener does not know aboutWe have a problem.There was a hole in the fence.Suddenly they heard a loud bang.2. used to show that you are referring to a general type of person or thing and not a specific person or thing.Would you like a sandwitch?I want to train to be an engineer.He's realy a nice man.Take a look at this.It needs a good clean.3. used before someone's family name to show that they belong to that familyOne of his daughter had married to a Rothschild.4. onea thousand poundsa dozen eggsYou'll have to wait an hour or two.5. used in some phrases that say how much of something there isThere were a lot of people at the party.A few weeks from now I'll be in Venice.You have caused a great deal of trouble.6. used to mean each when starting prices, rates, or speedsI get paid once a month.The eggs cost two dollars a dozen.7. used before singular nouns to mean all things of a particular typeA square has four sides.A child needs love and affection.8. used once before two nouns that are mentioned together very oftenI'll fetch you a cup and saucer.Does everyone have a knife and fork?9. used before the ing forms of verbs when they are used as nouns referring to an action, event, or soundThere was a beating of wings overhead.Bernice becomes aware of a humming that seemed to come from all around her.10. used before nouns that are usually uncountable when other information about the quality, feeling is added by an adjective, phrase, or CLAUSECandidate must have a good knowledge of chemistry.11. used before the name of a substance, food to refer to a particular type of itUse a good cheese to make the sauceplants that grow well in a moist soil.12. used before the name of a drink to refer to a cup or glass of that drinkCan I get you a coffee?Renwick went to the bar and ordered a beer.13. used before the name of a famous artist to refer to a painting by that artistan early Rembrandt14. used before a name to mean someone or something that has the same qualities as that person or thingShe was hailed a new Manlyn Monroe.15. used before someone's name when you do not know who they areThere is a Mr Tom Wilkins on the phone.16. used before the names of days, mounths, seasons, and events in the year to refer to a particular oneWe arrived in England on a cold wet Sunday in 1963.I can't remember a Christmas like it.