Present+Perfect+Simple

__USES__

 * Present Perfect is used to say that an action has happened at an unspecified time before. The exact time is unimportant, so it cannot be used with specific time expressions (such as yesterday, one week ago, when I was a child...) but with unspecific expressions (such as: ever, never, before...)
 * Example: I __have see__n that movie. I __have not read__ that book before.
 * The "unspecified time" may be confusing sometimes. In order to make it easy, it is usually related with topics such as:
 * Experience: I __have studied__ french
 * Change over time: I __have improved__ my french since I live in France.
 * Accomplishments: The Lord of the Rings __has won__ several prices.
 * An uncompleted action you are expecting: Bill __has still not arrived__.
 * Multiple actions at different times: She __has visited__ a lot of cities this year.
 * We can use this tense to express an action that is still going on or that stopped recently, but has an influence on the present.
 * Example: I __have been__ ill for a week. She __has lived__ in Austria for three months

**__FORM__**

 * Verb "to have" + past participle [verb_ed when regular; 3rd columnd of the list of irregular verbs when irregular]
 * || Affirmative || Negative || Question ||
 * I/You/We/They || I have eaten || I have not eaten || Have I eaten? ||
 * He/She/It || He has studied || He has not studied || Has he studied? ||