Jul 12, 2018 · Prefixes in-, im-, ir-, il- are all forms of the same thing, which to use depends on the beginning of the following word. Of course un- is different.
Mar 5, 2018 · According to the Cambridge dictionary, on it means informally doing something that needs to be done, or trying to solve a problem. In my experience it doesn't imply one or the other. In fact,.
