My question involves landlord-tenant law in the State of: Illinois

I'm renting in Rockford, il, My question is can my landlord still charge me the last two months rent even if I give them a 30-day written notice? Now it says nothing about this in my lease, all it talks about in my lease is abandonment. And thats not what I'm doing, they say that I will forfeit my deposit and have to pay the rent until she finds somebody to move in. And mean it says nothing in my lease about terminating it early. Any help would be appreciated, thank you