- In Spanish, verbs are affirmative unless they are made negative through the use of "no," or a negative expression.
- Unlike English, double, or even triple, negatives are permitted.
- When using "no," a second negative can either follow immediately afterward OR be placed at the very end of the sentence.
- When the negative expression is BEFORE the verb, "no" isn't needed.
- NADIE and ALGUIEN refer only to PEOPLE and require the personal A when the appear as DIRECT OBJECTS of the verb.
- ALGUNO and NINGUNA drop the -O before a masculine, singular noun in the same way the number "uno" shortens to "un." Use an accent where needed, normally at the very last vowel of the word.
- NINGUNO is almost always used in the singular, nor the plural form. The exception would be when used with inherent plural nouns such as things that come in pairs.