present perfect

Tema: Review of tenses

Resumen del tema: Present perfect: We use the Present Perfect to say that an action happened at an unspecified time before now. The exact time is not important. You CANNOT use the Present Perfect with specific time expressions such as: yesterday, one year ago, last week, when I was a child, when I lived in Japan, at that moment, that day, one day, etc. We CAN use the Present Perfect with unspecific expressions such as: ever, never, once, many times, several times, before, so far, already, yet, etc. FORM [has/have + past participle]

Aprendizaje del tema: In this issue in the affirmative, swaps the best person gets the auxiliary have / have followed the past participle verb form plus supplements. in the negative form is the best person first auxiliary verb Have not more in the same way that the more affirmative interrogative complement in the first is the auxiliary have / have dependdiendo of the person followed by the verb plus supplements

Referencias ordenadas con el estilo APA: http://www.englishpage.com/verbpage/verbtenseintro.html