My main language is German and English is secondary. I don't want to begin pointing out the many grammar errors in these posts alone. However, the OP has me concerned.
"My mother tongue is not english, and in school we spend a lot of time on learning english and the grammar." Perhaps you should rewrite this sentence as such.
While attending school I spent a significant amount of time studying English and it's proper grammar, however my native language is not English.
SHOOT THE PALLY!