Present perfect tense

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?"