Express contract Implied$-$in$-$fact contract Implied$-$in$-$law contract Executed contract Executory contract Void contract Voidable contract Unenforceable contract Phrase Bank:Illegal contractImposed by law to prevent unjust enrichmentContract exists but cannot be enforced in courtFormed either by oral or written words or bothContract duties have not been performedFormed by parties conductContract duties completely performedContract duties have not been performe