articles: introduction

The correct use of the articles (a/an and the) is one of the most difficult points in English grammar. Fortunately, most article mistakes do not matter too much. Even if we leave all the articles out of a sentence, it is usually possible to understand it.
Please can you lend me pound of butter till end of week?
However, it is better to use the articles correctly if possible. Sections 39 to 45 give the most important rules and exceptions.
Most Western European languages have article systems very like English. You do not need to study sections 39 to 41 in detail if your language is one of these: French, German, Dutch, Danish, Swedish, Norwegian, Icelandic, Spanish, Catalan, Galician, Italian, Portuguese, Greek, Romanian. If your language is not one of these, you should study all of the sections 39 to 45.
To understand the rules for the articles, you need to know about countable and uncountable nouns.