Welcome to English grammar spot. This lesson is about the present perfect.
In this lesson I am going to show you how
to form a present perfect,
and when to use a present perfect.
But before we get started it's good to
know how to conjugate the verb 'to have'.
For the singular forms:
I have
you have
he has
she has
it has.
For the plural forms:
we have
you have 
they have.
It's also good to know that in the English language there are regular
and irregular verbs.
And it is advisable that you study the most commonly used irregular verbs.
Now let's get started.
Take a look at these sentences:
I have painted the door yellow.
They have paid for dinner themselves.
Both these sentences are in the present perfect tense.
How to form a present perfect.
Let's have a look at the regular verbs.
For the regular verbs we use the auxiliary verb 'to have'.
and the past participle. 
You can make the past participle by adding 'ed' to the infinitive form of the verb.
Now let's have a look at the singular forms.
I have worked there. 
You have listened carefully.
He has cleared the table.
She has placed it on the floor.
It has snowed.
For the plural forms:
We have walked to school.
You have watched the tennis match.
They have marked the tests.
Now we need to pay extra attention to verbs
that end in an 'e'.
Such as live, close and wipe.
for these verbs we use the auxiliary verb to
have and the past participle.
But the past participle is made by simply adding a '-d' to the verb. 
Look at the examples:
I have lived here for quite some time now.
He has closed the window.
They have wiped the floor.
We also need to pay attention to verbs that end in a 'y',
especially those preceded by consonant
such as spy and study
because we change the '-y' into an 'i'.
For example:
He has spied on his neighbours.
We have studied hard.
Now let's have a look at the irregular
verbs.
For the irregular verbs we also use the
auxiliary verb to have and the past participle.
But for the irregular verbs the past participle
has a unique present  perfect form.
Take a look at the examples:
I have built that shed with my own two
hands.
The infinitive form of the verb is to build.
She has bought some flowers at the market.
The infinitive form of the verb is 'to buy'.
We have run the marathon.
The infinitive form of the verb is to run.
Now let's have a look at the present
perfect in questions.
First for the regular verbs.
again we use the auxiliary verb 'to
have' and the past participle.
Has she talked to him yet?
Have you kicked the ball?
Have they ever worked on a farm?
For the irregular verbs:
we also use the auxiliary verb 'to have'
and the past participle,
but now the unique present perfect form.
For example
Has she quit her job yet?
Have you ever driven a car?
Have they ever paid for dinner?
Let's have a look at the present perfect
in negations.
For the regular verbs
the auxiliary verb 'to have'.
and we add 'not', 
contracting it into haven't or hasn't
and the past participle.
I haven't listened to the news.
It hasn't rained since Friday
They haven't closed the window.
For the irregular verbs we also use the verb 'to have',
and not contracting it into
haven't and hasn't
and the past participle.
For example:
She hasn't quit her job. 
The infinitive form is 'to quit'.
You haven't ever driven a car.
The infinitive form is 'to drive'.
They haven't paid for dinner.
The infinitive form of the verb is 'to pay'.
Let's have a look at the present
perfect in use.
We use the present perfect for things
that happened in the past,
but it is not important when they
happened.
I have been to Scotland.
It's not important
when I've been there,
it's important that I've been to Scotland.
They've decided to buy a car.
It's not important
when they decided it, the decision alone
is important.
We also use the present perfect for
things that started in the past,
that have continued in the present.
For example:
Bob and Jack have known each other for ages.
For example they met in the 1970s, 
and they are still friends.
They have lived there since 2011. 
So they moverd there in 2011
and they've continued to live there.
We also use the present perfect,
when the following words are in a
sentence:
for
yet, never, ever, just
already since
Here are some examples:
I have lived here for three years.
We haven't seen that film yet.
Have you ever watched a football game?
I thank you for your attention.
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