Hello. Would you give me some tip on the usage of / the difference between

(1) So am I / So do I.
(2) Me too.

Thank you for your help!
"So am I", "so do I" and "me too", the difference in usage.


i) Mary: I am fed up with eating baked beans for breakfast every day.
ii) Jane: So am I/Me too. ( you cannot use "so do I")

i) Mary: I hate eating baked beans.
ii) Jane: So do I/ Me too. ( you cannot use "so am I")

i) Mary: My favourite is eggs, bacon and sausages for breakfast.
ii) Jane: Me too! ( you cannot use "so do I" and "so am I")
I think you can use both 'so am I' or 'me too', and 'so do I' or 'me too'. It's just that 'so am I' and 'so do I' sound more proper and are grammaticaly better to use.
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"me too" seems to have a universal use.

You can use "so do I" If there's no auxiliary in the main/first sentence, and if the verb's in the present tense:
"I love reading!" - "so do I"
"John hates bacon" - "so do I"
You can use "so am i" if "to be" is used in the present tense in the main/first sentence":
"I'm getting bored!" - "So am I"
"He's going to Japan in the fall" - "so am I"
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And then there's "So have I"!

I have been away for a three weeks.

What a coincidence! So have I!
Ad 3)
i) Mary: My favourite is eggs, bacon and sausages for breakfast.
ii) Jane: So is mine.
I'm not a native speaker too, but I'd use this expression. "Mee too!" sounds a little bit...strange I think.
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I'd say:
"my favourite breakfast is..."
"so is mine"
But "me too" sounds good too.
"Mine too", maybe?


we use so do I when there is a notional verb

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