Present Perfect Tense | ENGLISH PAGE
www.englishpage.com › verbpage › presentperfectWe CAN use the present perfect with unspecific expressions such as ever, never, once, many times, several times, before, so far, already, yet, etc. Examples: I have seenthat movie twenty times. I think I have methim once before. There have beenmany earthquakes in California. People have traveledto the Moon. People have not traveledto Mars.