Think of adverbs as modifiers: they modify elements of a sentence (verbs, adjectives, other adverbs). Adverbs answer questions such as "where?", "when?", "how long?", "how much?", or just "how?".
  Spanish adverbs are easy to spot, because many of them of them have the ending "-mente", which is similar to the English ending "-ly". Because adverbs don´t modify nouns or pronouns (that is the adjectives job) , you don´t have to worry about gender or number agreement.
  Adverbs of time show when the action of the verb takes place.

- Él ya ha llegado. (He has arrived already.)
- Anteayer jugamos fútbol. (We played soccer the day before yesterday.)
- Jaime vendrá luego. (Jaime will come later.)
- Siempre llueve en Londres. (It always rains in London.)