Foi/Fui/Era - Pretérito Perfeito vs Imperfeito, what is the difference?

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What's the difference between FOI and ERA in Portuguese?
How to use the Pretérito Perfeito and Pretérito Imperfeito in Brazilian Portuguese?
If you have this doubt, watch the video and find out! :)

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Exercises!
Write these sentences in Portuguese:
1) I was an actress for five years, now I'm a singer.
2) I traveled to Europe once when I was an actress.
3) I know how my children feel because I was a child too.
4) I traveled to Europe three times when I was a child.
5) Einstein was a brilliant scientist.

Видео Foi/Fui/Era - Pretérito Perfeito vs Imperfeito, what is the difference? канала Falando Nisso com Andressa Maia