PRESENT PERFECT

Present Perfect Tense

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This webpage explains the present perfect form in Spanish. ( Esta página os explica el "present perfect" en español)

http://www.aulafacil.com/CursoIngles/Clase13.htm

In this website, you can find lots of practice from easy to difficult level. (En esta página, puedes encontrar ejercicios de menor a mayor dificultad)

http://isabelperez.com/happy/tenses/pres_perfect.htm

Here's a quiz for you to practice the present perfect! (Aquí hay un concurso para que practiques el present perfect)

http://www.saywhatesl.com/quizes/presentperfect_mx.htm

Changing sentences from present simple to present perfect. (Página para cambiar del presente simple al present perfect)

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/prperf2.htm

Choose the right option in (elige la opción correcta en) http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/prperf1.htm

Complete the sentences in.. (completa las frases en...)

http://usuarios.lycos.es/englishweb/gramatica/PresentPerfectaffir1.htm

FOR AND SINCE

Explanations and practices. (Explicación y práctica)

http://pagesperso-orange.fr/michel.barbot/hotpot/since_for/sincefor1.htm

http://www.englishmedialab.com/Quizzes/intermediate/since%20for%20last%20ago.htm

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf1.htm

http://a4esl.org/q/h/9807/km-sincefor.html