I know 5 and am learning Portuguese.
Breaking down the languages and learning the top 100-500 most spoken words in English and then learning them in the new language helps... then learn the way the verbs are conjugated.
Tim Ferriss has a good breakdown.
http://www.fourhourworkweek.com/blog...ning-language/
I use Rosetta Stone to help me learn Portuguese, currently.
The army taught me Russian. I learned Spanish in high school and working at restaurants. I know enough Arabic and Mandarin... and I'm getting Portuguese down.
And I speak pig latin.