Introduction to Omission article used to A and An

Rule 1: The form a/an is used before plural nouns:

a/an has no plural form. So the plural of a dog is dogs, and of an egg is eggs.

Rules 2: Before names of meals, except when these are preceded by an adjective:

• We have breakfast at eight. 
• He gore us a good breakfast.

The article is also used when it is a special meal given to celebrate something or in someone’s honor:

• I was invited to dinner (at their house, in the ordinary way) but 
• I was invited to a dinner given to welcome the new ambassador.

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