How to Use "mourn" with Example Sentences

1. Shia muslims in iran mourn the death of their imam hussain .
2. Hundreds of thousands of lithuanians jammed the procession route to mourn their national heroes .
3. If animals sent to war had no choice , why mourn only the allied ones ?
4. Some must mourn its passing .
5. If this era is over , few will mourn its passing .