When should I use Haber?
The verb Tener means "to have" and it refers to possession. If I want to say "I have to go", I don't think tener is the proper verb to use (but, if it is please let me know). For this sentence, am I able to use haber (yo he ir) or should I use necesitar (yo necesito ir)? Is it okay for me to use both haber and necesitar? Can haber be used in a sentence without another verb?
If someone asks me, "Have you ever...?" and I want to answer with "Yes, I have." can I say, "Si, yo he."?
NOTE: My thought process is that I should not use the verb tener in the example sentence above because it doesn't speak about possessing or owning anything.