It's not advisable to simply substitute "also" for "too". "Too" should be put at the end of the sentence. Here's why: My shirt is also red. My shirt is too red. My shirt is red, too. The second sentence has a completely different meaning to the third sentence. Word order is important here. For "wanna", do yourself a favour and never use it. It's poor and lazy English. Native English speakers who use this form are considered lazy and probably failed at school. Please avoid copying our bad examples. ;)

Also and too have identical meanings and can be interchanged (substituted for each other). Wanna is slang (improper grammar) for want to. Wanna is OK for informal communications like text messaging but should never be used in formal communication.

My teacher said that Wanna = need + want is it correct?

thanks a lot!.. i understand a little but i have to practice!.. you can tell me what is difference of "in" and "on´"?.. if i wrote something wrong tell me please! am here to learn

Karen I speak English but I am not a teacher. "also" can mean "and" or "another". Too is similar but not the same. I will give you examples. We went touring to Venezuela "also" to Colombia. We went touring to USA too many times to remember. Hope this helps.