Articles A,An,The

1. These are Demonstrative Adjectives.
2. A and An are indefinite articles;
3. They point out  a person or thing in general.
4. I met a boy. Was that boy short/ fat/ lean/ tall/ ??? we do not know.
5. I ate an apple.Which apple, Kashmir apple,Australian apple, Red apple, yellow apple or green apple??
6. We do  not know which apple?
7. In both these cases it does not point out any person or thing in  particular.
8. A is also used  before a word beginning with a consonant sound.
9. A European, A hole, A ewe,  A university.A unicorn, A table, A yard,  A one rupee coin, 
10. AN is used  before a word beginning with a vowel sound. and h mute or silent.
11. An animal, An individual,An angry  man,An enemy, An ink-pot, An owl, An umbrella, an heir, an honest man, an hour.An hotel,
12. THE- is the definite article.
13. A singular noun representing  a whole class.
14.  The lion is the king of the forest.
15. The camel is the ship of the desert.
16. The donkey is the beast of burden.
17. The rose smells sweet.
18. The whale is a kind of mammal.
19. Man or woman used as representing a whole class you can;t use The.
20. Example: Man is the wonderful creation of God.
21. Why? He can think and speak.
22. Woman is the blessing of God.
23. Why? She brings forth a man or woman.
24. Representing  a profession as a class.
25. A carpenter  makes chairs and tables.
26. A doctor treats the patients.
27. A cobbler mends our shoes.
28. When speaking of someone or something already referred to:
29. The boy who came wore a red shirt.
30. The story which he told was very interesting.
31. Talking of a particular person or thing:
32. Do you like the electric fan?
33. The fellow whom you saw is a great orator.
34. The poor beggar did not get any alms.
35. Let us all go to the playground now.
36. When we refer to scriptures or classical books.
37. The Gita, The Quran, The Holy Bible/
38. when referring to the newspapers, journals
39. The Hindu,The Indian Express, The Economic Times,
40. When referring  to the imaginary geographical lines;
41. The Equator, The Tropic of Cancer, The Tropic of Capricorn, The Longitude, The latitude,  etc,
42. When referring to bays, gulfs, canals, hills, mountains, peaks, glaciers, rivers, oceans, seas, group of islands, straits, ocean currents, sea channels.:
43. The Himalayas, The Alps
44. The Everest, The Shivalik Hills, The Gangotri Glacier,The Ganges, The Kaveri, the Nile, The Narmada,
45. The Panama Canal, The Suez Canal
46. The Indian Ocean, The Pacific Ocean,
47. The Arabian Sea, the Mediterranean  Sea,
48. The Persian gulf, The bay of Bengal, The English Channel,
49. The British Isles, The West Indies,
50. The Strait Gibraltar, The Gulf Stream,The Equator current.
    
51. will be continued later.