The word "it" is an English pronoun that is often used to refer to something that has already been mentioned or is easily understood from the context. It is a very common word in English and can be used in many different situations.
Referring to a Thing:
Referring to a Situation:
In Impersonal Constructions: "It" is often used in sentences that do not have a clear subject.
In Expressions of Time or Distance:
Idioms:
Phrasal Verbs:
"It" is a simple but very useful pronoun in English. It helps us refer to things without repeating names and is used in many expressions and idiomatic phrases.