Do you ever pause when writing a sentence, uncertain whether to use 'who' or 'whom'? You're not alone. Even native English speakers often interchange these pronouns, leading to grammatical errors. 'Who' and 'whom' are relative pronouns meant to link different parts of a sentence. 'Who' is a subjective pronoun, referring to the person or thing performing an action. For example, 'Who ate the last cookie?' Here, 'who' is the subject performing the action 'ate'. On the other hand, 'whom' is an objective pronoun, used to refer to the person or thing the action is directed towards. For instance, 'Whom did you invite to the party?' In this case, 'whom' is the object receiving the action 'invite'. Using 'who' instead of 'whom' or vice versa can drastically change a sentence's meaning. 'Who did you speak to?' implies your interest is in the individual who was speaking, while 'Whom did you speak to?' asks about the person spoken to. Historically, English language rules touted 'whom' as the grammatically correct choice in certain contexts. However, in today's informal and conversational English, 'who' is often used in place of 'whom'. This illustrates how language is a fluid, evolving entity. Understanding the intricacies of 'who' and 'whom' requires practice and patience. But the effort is worth it, as it not only improves your English but also facilitates better communication.