How is "it's" different from "its"? They look pretty much the same. How do they work? For example, in sentences such as:
It's collar was shaking.
Its collar was shaking.
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"It's" means "It is". This is a verb "contraction" used quite often in English. "Its" (no apostrophe) means the subject or object is replaced by the indefinite noun "It"... and "Its'" is a possessive noun. Note: the word "is" in my last phrase denotes action. It is a verb describing the action of (ITS'), which is the subject. Just remember that It can apply to some undefined object (the planet). Eg: Freedom is fragile and if it is to survive, its foundation must be strong. Here, its refers to the noun Freedom, i.e. the foundation of Freedom must be strong.
A subject is the person, place, or thing that performs the action (verb). A noun or pronoun can be used as the object in a sentence. An object is the person, place, or thing that receives the action.
E.g. "Its going to be rainy tonight" i.e. "The weather or conditions will be rainy tonight. "Its" implies the weather. Here, it is an object, the conditions refer to the weather, making "Its'" a possessive pronoun. The weather is a subject. (THE subject) !