What is the key to all conditional clauses?

If a condition in a contract does not occur, public policy will require only substantial performance by the party for whom the condition failed.

If a contract contains a conditional clause, the requirement of good faith will be eliminated.

If a condition in a contract does not occur, one party will probably be discharged without having to perform his or her obligations under the contract.

$$ If a contract contains a conditional clause, it must be expressly written with specific language.