Here are a few examples of how to use "ironic" in a sentence:
* It's ironic that the fire station burned down. (This is ironic because fire stations are supposed to protect against fires.)
* The comedian's joke about how bad his life was was ironically very funny. (The joke was funny because it was ironic, given how bad his life was.)
* It was ironic that the only person who could help us was also the one who had betrayed us. (This is ironic because the person who should be helping them is the one who has hurt them.)
Remember, "ironic" refers to a situation that is the opposite of what is expected, or that has an unexpected twist.