The doubts panhispánico Dictionary records four incorrect uses of the comma:
1. It is incorrect to write comma between subject and verb of a sentence, but the subject is composed of several elements separated by commas (eg, prayer roses, carnations, daisies, jasmine, are their favorite flowers , incorrect comma between "jasmine," are "). When the subject is long, usually made orally a pause before the start of the predicate, but this break is not to be graphically coma.
This rule has two exceptions:
a) When the subject is a list so that it closes (or its abbreviation): The groom, relatives, guests, etc., And the expected arrival of the bride .
b) When the subject immediately after an item is opened or appears any of the elements that are isolated from the rest of the sentence commas: My brother, as you know, is a superb athlete .
2. You should not write comma before the conjunction that when this makes sense in a row and is preceded immediately or not, as (to) or such : He liked the dress I bought it immediately (in this sentence would be incorrect to put a comma between "clothing" and "that").
3. Coma is not written but behind when it precedes a interrogative or exclamatory. The following is an example of incorrect use: But who are you? Do not know .
4. The use of the comma after the greeting formulas in letters and documents is an anglicized spelling should be avoided, in English used the colon.
