present tense, past tense, past participal

Can someone explain the past participal for me please.

When would this be used?

Example : begin ; began ; begun

Eample : see ; saw ; seen

Have you saw John ? ( for example)

have you seen John? .................

I saw him two minutes ago.

I seen him two minutes ago.

Is one of these sentences wrong and why?

Thanks in advance.

Quote:

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Originally Posted by aisog

Can someone explain the past participal for me please.

When would this be used?

Example : begin ; began ; begun

Eample : see ; saw ; seen

Have you saw John ? ( for example)

have you seen John? .................

I saw him two minutes ago.

I seen him two minutes ago.

Is one of these sentences wrong and why?

Thanks in advance.

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What grammar book are you using?

None.