What's the difference between "its" and "it's"?
It's vs its is one of the most common English grammar mistakes made.
Its (no apostrophe) is the possessive form of the pronoun it. Most possessives use an 's, which is probably the reason that many people find this confusing.
Its mouth opened wide like a dark cave.
That was the second time I saw its effects.
When you see its eyes open, you should run.
It's (with apostrophe) is the shortened form of it is. This contraction is the reason why the possessive form lost its apostrophe.
It's time to leave right now.
Make sure it's written correctly this time.
There's no doubt it's the best option.
So, remember, if you can write it is instead, then use an apostrophe. Otherwise, miss it out.