Simple past vs past continuous vs past perfect

[Sunflower.baby]

Hi guys,

I'm very confused of using these tenses above. I don't have any confident that I manage to use them correctly for both 'speaking' and 'writing'.
Could anyone help to give me some hints about them so that I can easily remember and manage them?

I highly appreciate your comments.

[Mister Micawber]

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Use simple past for a past accomplished event: I ate sushi last night.
Use past continuous for a past action that continued during another past event: I was eating sushi last night when my ex-wife walked in.
Use past perfect to indicate the sequence of 2 non-simultaneous past events: I had eaten all of my sushi when she threw the flounder at me.
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Native English teacher at Mister Micawber's

[Sunflower.baby]

Thanks for pointing out some good examples! I think I need more practices about these tenses to manage them automatically... :(.

BTW, did you really have sushi last night? I wonder if your examples are what happened to you last night? Just kidding... :). Sushi is nice anyway, I like it! ;)