*The Present Perfect Tense:
Form:
I/we/you/they +have +p.p.
He/she/it + has +p.p.
Use:
The present perfect has different uses and the key words affects its meaning as follows:
It expresses an action that happened at an unknown time.We don't use a key word here.
EX: I have played chess.
It expresses an action that started in the past and is still continuing.We use for or since here.
EX:She has lived in London for three years.This sentence means that she is still in London .
EX: She has lived in London Since 2015.
It expresses an action that hasn't happened yet.We use never or yet here.
EX:I have never ridden a horse.
EX:I haven't ridden a horse yet.
It expresses an action that happened a short time ago.We use already or just here.
EX:They have already done their homework.
EX:We have just finished our homework.
It is also used to ask about previous experiences.We use ever.
Notice: Ever comes in Yes or No question.
EX:Have you ever seen an actor?
Negative:
We put (not(n't) to has or have.
EX:He has not (hasn't) eaten chicken.
EX:I have not (haven't) broken the window.
Question:
Yes Or No question:
We invert the the subject and the verb to have.EX:Have you answered the questions?
EX:Has she washed the dishes?
