"I have a green flag,, and she has a green flag too."

Translation: Mi havas verdan flagon, kaj ankaŭ ŝi havas verdan flagon.

[KingPlutoIX]

I always forget why, but why does ankaux have to come infront again?

[mizinamo]

It emphasises the thing it comes in front of.

So "Ankaŭ ŝi havas verdan flagon" would mean "not only do I have a green flag, but she does too".

"Ŝi ankaŭ havas verdan flagon" could mean "She not only likes green flags, she has one, too". (Though I would also use it as a general sentence, even for the "not just I do but she does as well" case.)

"Ŝi havas ankaŭ verdan flagon" could mean "She has not only a blue flag but a green one as well", or "She has not only a car but also a green flag".

[KingPlutoIX]

ok thanks

[KainHaart]

What about "Ŝi havas verdan flagon ankaŭ" ?

[mizinamo]

That would mean "I speak English better than Esperanto", I think. It sounds very odd to me though you would probably be understood. Perhaps like "She has too a green flag" in English.