Sum Up Unit 3
Present Perfect Simple
It is a verb tense
Subject+have/has+ past participle
Two uses
The present perfect can show a finished past action
It shows an actions that stared in the past and continues to present
Permance/Finished
Time Expression Meaning
They indicate the time in which a certain action happened.
Yet
Something you haven't done/no past
experience
Their position is at the end of the sentence.
Already
Having done something/experience
in the past
Their position is after the subject or the verb "have".
For
Time taken/time
Their position is before time
Since
When it started/moment
Their position is before time
Verbs Tense
Show the time that an actions takes place
Time Expression with Present Perfect
They help to establish the time and the repercussion of an action
Yet
Unfinished action /life not experienced
We don't know when it happened, but it already happened
Already
Indefinite past / results or achievements.
For
Repetition from past to present
It can happen again, it focuses on how long it lasts
Since
Permanence from past to present
Indicates that the action has already started, but is still continuing
Present Perfect Progressive
It is a verb tense
Subject+ have/has+ been+ ing form
Actions that stared in the past, continue to the present and will continue in the future
The contractions can be used
Short form
Have = 've
Has = 's
Singular and pronuns
Temporality/Continuity
Verbs
Auxiliary Verbs
They are grammar verbs. They communicate time (present, past, future) or aspect (simple, progressive, perfect)
Main Verbs
communicate the idea or action of
the sentence