Noun:
* The chain of events leading to the accident was unclear.
* He broke the chain on his bicycle.
* The chain of command was disrupted by the sudden resignation.
Verb:
* The prisoners chained together were forced to march.
* The dog was chained to the porch.
* The store chained its doors shut at night.
Both Noun and Verb:
* The chain store chained its employees to a strict dress code.
* They chained the fence together using a heavy chain.
Let me know if you'd like me to provide examples of other ways to use "chain" in sentences!