Structure: how to make the present perfect tense

How do we make the Present Perfect Tense?

The structure of the present perfect tense is:
subject+auxiliary verb+main verb
havepast participle
Here are some examples of the present perfect tense:
subjectauxiliary verbmain verb
+IhaveseenET.
+Youhaveeatenmine.
-Shehasnotbeento Rome.
-Wehavenotplayedfootball.
?Haveyoufinished?
?Havetheydoneit?

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 haveI've
You haveYou've
He has
She has
It has
John has
The car has
He's
She's
It's
John's
The car's
We haveWe've
They haveThey'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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