They are interested in something And They have interest I know how to use 'They are interested in something' But I am confused with using it in this form. They have an(?) interest to(?) something. or They have interests? or just They have interest to something? I don't know whether interest should be plural or just stay as it is or need 'a' before it. In addition, I don't know what to put after interest. They have interest (in) football? They have interest (of) football? Please help me out with this thing! Thanks a lot for your help in advance! Hyunwook