The document discusses the present perfect verb tense in English. It provides the form of the present perfect which is "has/have + past participle" and examples such as "You have seen that movie many times." It also discusses two main uses of the present perfect tense: 1) to refer to an unspecified time before now, and 2) to emphasize a connection with the present. Specific time expressions like "yesterday" cannot be used with the present perfect tense.

1. Englishpage.com > Verb Tense Tutorial > Present Perfect
Intro.
Verb Tense
Present Perfect
Types of
Verbs
FORM
Active/Passiv [has/have + past participle]
e
Simple Examples:
Present
Present • You have seen that movie many times.
Continuous • Have you seen that movie many times?
Simple Past • You have not seen that movie many times.
Past
Continuous Complete List of Present Perfect Forms
Present
Perfect
USE 1 Unspecified Time Before Now
Present Perf.
Cont.
Past Perfect
Past Perfect We use the Present Perfect to say that an action happened at
Cont. an unspecified time before now. The exact time is not
Simple important. You CANNOT use the Present Perfect with specific
Future time expressions such as: yesterday, one year ago, last week,
Future when I was a child, when I lived in Japan, at that moment, that
Continuous day, one day, etc. We CAN use the Present Perfect with
unspecific expressions such as: ever, never, once, many times,
Future
several times, before, so far, already, yet, etc.
Perfect
Future Examples:
Perfect Cont.
Used to • I have seen that movie twenty times.
Would • I think I have met him once before.
Always • There have been many earthquakes in California.
Future in the • People have traveled to the Moon.
Past
• People have not traveled to Mars.
• Have you read the book yet?
• Nobody has ever climbed that mountain.
• A: Has there ever been a war in the United States?