Various Grammars for Obligation in Japanese Language

We learned about grammar for obligation yesterday, but there are some other various ways in obligation using conditional ~nakereba narimasen and ~nai to ikenai/dame. Today, we will learn ~nakereba narimasen and ~nai to dame/ikenai^^, don't need small talk, let's begin:
Grammar ~nakereba narimasen (~なければなりません)
JLPT Level: N4 Meaning: Must Must learn before: ~ba conditional form Formula: ~ba