When to Use Who Or Whom?

The words ‘who’, and ‘whom’, can sometimes get tricky when using them in a sentence, because they both sound fine. However, ‘who’ is used for a subject, and ‘whom’ is used for an object. Sometimes, if you try to replace the word, with the words ‘her’ or ‘him’, and it makes since, then the word ‘whom’ would be used. If you replace the word, with the words ‘he’ or ‘she’, then the word ‘who’ would be used.