1. My best friend (not) in his house because he in the university of Los Angeles.
    The first sentence is negative and the second is affirmative.
  2. Oh no!! It is cloudy so it a lot and they football in the stadium; they are professionals.
    The first idea is singular and the second is plural.
  3. Please, be quiet!! Some children their compositions and those six years old girls their favorite books.
    Composition (a piece of writing) / The word “books” is the key.
  4. This is the best festival. Many people to the local bands but only one guy musical videos over there.
    In the first the preposition “to” is the link. In the second “videos” the verb is “watch” in present participle.
  5. Right now in Alexa´s house her cousin the table and her parents the dishes in the kitchen.
    The only verb that goes with “table” is “cleaning”. In the second sentence the collocation is “do the dishes”.