約束を破ってはならない。

promise; agreement; arrangement; one's word; contract; pact; appointment; engagement; date; convention; rule; destiny; fate

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to tear; to break; to destroy; to break through (opponent's defense etc.); to breach; to defeat; to beat; to shatter (dream, peace, etc.); to disturb; to violate (a rule etc.); to break (a promise etc.); to break (a record)

if ... then; when; and; why don't you...?; the more (one does something); because; since