How do we make the Present Perfect Tense?

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How do we make the Present Perfect Tense?

The structure of the present perfect tense is:

subject	+	auxiliary verb	+	main verb
		have		past participle

Here are some examples of the present perfect tense:

	subject	auxiliary verb		main verb
+	I	have		seen	ET.
+	You	have		eaten	mine.
-	She	has	not	been	to Rome.
-	We	have	not	played	football.
?	Have	you		finished?
?	Have	they		done	it?

Contractions with the present perfect tense

When
we use the present perfect tense in speaking, we usually contract the
subject and auxiliary verb. We also sometimes do this when we write.

I have	I've
You have	You've
He has She has It has John has The car has	He's She's It's John's The car's
We have	We've
They have	They've

Here are some examples:

• I've finished my work.
  
• John's seen ET.
  
• They've gone home.
  

He's or he's??? Be careful! The 's contraction is used for the auxiliary verbs have and be. For example, "It's eaten" can mean:

• It has eaten. [present perfect tense, active voice]
  
• It is eaten. [present tense, passive voice]
  

It is usually clear from the context.

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How do we use the Present Perfect Tense?

This tense is called the present perfect tense. There is always a connection with the past and with the present. There are basically three uses for the present perfect tense:

1. experience
   
2. change
   
3. continuing situation
   

1. Present perfect tense for experience

We often use the present perfect tense to talk about experience from the past. We are not interested in when you did something. We only want to know if you did it:

I have seen ET. He has lived in Bangkok. Have you been there? We have never eaten caviar.
past	present	future
!!!
The action or state was in the past.	In my head, I have a memory now.

Connection with past: the event was in the past.
Connection with present: in my head, now, I have a memory of the event; I know something about the event; I have experience of it.
2. Present perfect tense for change

We also use the present perfect tense to talk about a change or new information:

I have bought a car.
past	present	future
-	+
Last week I didn't have a car.	Now I have a car.

John has broken his leg.
past	present	future
+	-
Yesterday John had a good leg.	Now he has a bad leg.

Has the price gone up?
past	present	future
+	-
Was the price $1.50 yesterday?	Is the price $1.70 today?

The police have arrested the killer.
past	present	future
-	+
Yesterday the killer was free.	Now he is in prison.

Connection with past: the past is the opposite of the present.
Connection with present: the present is the opposite of the past.

Americans
do not use the present perfect tense so much as British speakers.
Americans often use the past tense instead. An American might say "Did
you have lunch?", where a British person would say "Have you had lunch?"
3. Present perfect tense for continuing situation

We often use the present perfect tense to talk about a continuing situation. This is a state that started in the past and continues in the present (and will probably continue into the future). This is a state (not an action). We usually use for or since with this structure.

I have worked here since June. He has been ill for 2 days. How long have you known Tara?
past	present	future
The situation started in the past.	It continues up to now.	(It will probably continue into the future.)

Connection with past: the situation started in the past.
Connection with present: the situation continues in the present.

For & Since with Present Perfect Tense

We often use for and since with the present perfect tense.

• We use for to talk about a period of time - 5 minutes, 2 weeks, 6 years.
  
• We use since to talk about a point in past time - 9 o'clock, 1st January, Monday.
  

for	since
a period of time	a point in past time
	x------------
20 minutes	6.15pm
three days	Monday
6 months	January
4 years	1994
2 centuries	1800
a long time	I left school
ever	the beginning of time
etc	etc

Here are some examples:

• I have been here for 20 minutes.
  
• I have been here since 9 o'clock.
  
• John hasn't called for 6 months.
  
• John hasn't called since February.
  
• He has worked in New York for a long time.
  
• He has worked in New York since he left school.
  

For can be used with all tenses. Since is usually used with perfect tenses only.

Present Perfect Continuous Tense

I have been singing

How do we make the Present Perfect Continuous Tense?

The structure of the present perfect continuous tense is:

subject	+	auxiliary verb	+	auxiliary verb	+	main verb
		have has		been		base + ing

Here are some examples of the present perfect continuous tense:

	subject	auxiliary verb		auxiliary verb	main verb
+	I	have		been	waiting	for one hour.
+	You	have		been	talking	too much.
-	It	has	not	been	raining.
-	We	have	not	been	playing	football.
?	Have	you		been	seeing	her?
?	Have	they		been	doing	their homework?

Contractions

When
we use the present perfect continuous tense in speaking, we often
contract the subject and the first auxiliary. We also sometimes do this
in informal writing.

I have been	I've been
You have been	You've been
He has been She has been It has been John has been The car has been	He's been She's been It's been John's been The car's been
We have been	We've been
They have been	They've been

Here are some examples:

• I've been reading.
  
• The car's been giving trouble.
  
• We've been playing tennis for two hours.
  

How do we use the Present Perfect Continuous Tense?

This tense is called the present perfect continuous tense. There is usually a connection with the present or now. There are basically two uses for the present perfect continuous tense:1. An action that has just stopped or recently stopped

We use the present perfect continuous tense to talk about an action that started in the past and stopped recently. There is usually a result now.

I'm tired because I've been running.
past	present	future
!!!
Recent action.	Result now.

• I'm tired ^[now] because I've been running.
  
• Why is the grass wet ^[now]? Has it been raining?
  
• You don't understand ^[now] because you haven't been listening.
  

2. An action continuing up to now

We use the present perfect continuous tense to talk about an action that started in the past and is continuing now. This is often used with for or since.

I have been reading for 2 hours.
past	present	future
Action started in past.	Action is continuing now.

• I have been reading for 2 hours. [I am still reading now.]
  
• We've been studying since 9 o'clock. [We're still studying now.]
  
• How long have you been learning English? [You are still learning now.]
  
• We have not been smoking. [And we are not smoking now.]
  

For and Since with Present Perfect Continuous Tense

We often use for and since with the present perfect tense.

• We use for to talk about a period of time - 5 minutes, 2 weeks, 6 years.
  
• We use since to talk about a point in past time - 9 o'clock, 1st January, Monday.
  

for	since
a period of time	a point in past time
	x
20 minutes	6.15pm
three days	Monday
6 months	January
4 years	1994
2 centuries	1800
a long time	I left school
ever	the beginning of time
etc	etc

Here are some examples:

• I have been studying for 3 hours.
  
• I have been watching TV since 7pm.
  
• Tara hasn't been feeling well for 2 weeks.
  
• Tara hasn't been visiting us since March.
  
• He has been playing football for a long time.
  
• He has been living in Bangkok since he left school.
  

For can be used with all tenses. Since is usually used with perfect tenses only.