[I was] or [I were]?

[Sunflower.baby]

Hi, I have a confused between "was & were"...
I remember sometimes i could say "I was..." or "I were...". Would you please help to point out which cases for the above situations? :-)

Any help is highly appreciated! ;-)

[Mister Micawber]

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Use 'I was' for indicative sentences: 'I was a tapdancer'; 'Was I late yesterday?'
Use 'I were' for subjunctive sentences: 'If I were Ruby Keeler, I would be able to tapdance'.
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Native English teacher at Mister Micawber's

[Sunflower.baby]

Hi, Mister, I got it. Thanks for your instructions! :-)