Impersonal verb

An impersonal verb is kind of like when you say "it is raining" or "it's hot outside". You're not really talking about a specific person or thing doing the action, you're just talking about what's happening. It's like talking about the weather - you don't usually say "the clouds are raining", you say "it's raining".

Sometimes people use impersonal verbs when they're talking about things that don't have a specific "doer". For example, if you say "it's necessary to study for tests", there's no one person or thing that's making it necessary - it's just a general idea that studying is helpful for doing well on tests.

So, an impersonal verb is a way of talking about actions or ideas without necessarily talking about who or what is doing them.