I used "quanto" instead of "como", and got this message: Be careful not to confuse "como" and "quanto"!
I am not sure when should I use one or the other. Any tips?
Man, i really see no difference. Plus: you can use either como, quanto or quão. All of them are acceptable, but the last one is hardly ever used. The most used is quanto, so your answer was certainly correct.
"Eles são tão fortes quanto nós" now accepted.
Can I use tanto instead of tão in this sentence?
Correct English is "they are as strong as we are'
Why do I use 'tão fortes como', and not 'tão' or 'come' twice?
Because you can't take it literally. As + adjective + as = tão + adjective + quanto (como).
Can it be used as "as" (He is as good as I am/ Ele é tão bom como eu) AND to note intensity "Você é tão alto!" (You are so tall!)