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How do we form Past Simple?
We put "-ed" to the end of the verb or use an irregular verb.
For example...
I played football yesterday.
I ate spaghetti last night.
How do we form Present Perfect?
We use have or has as a helping verb and a regular (verbs which take -ed ending) or an irregular verb. The short form is 've for have and 's for has.
For example...
I've never played rugby.
She's eaten spaghetti.