-in'

Etymology
Alternate pronunciation of with  instead of. It is derived from two sources: The two Old English suffixes became confused in Modern English, due at least partly to the practice of spelling them both as -ing.
 * the present participle suffix ;
 * the verbal noun suffix /.

Usage notes

 * In speech, the difference between the pronunciations and  is usually one of formality. Most speakers tend to use  in more formal situations and  in less formal situations. However, some speakers can either use mainly  or mainly  regardless of the situation.
 * In writing, both the and the  pronunciations are usually spelled -ing. When writers use -in', as in makin', they are emphasizing the informality of the situation (or attempting, however accurately, to show the social status of the speaker).
 * The pronunciation is more common for present participles and less common for verbal nouns.