英文grammer

it’s係「it is」，即係「它是」
its係「它的」
用法當然都唔同
例子：
it’s a dog.(牠是一隻狗。)
here is a dog,this is its tail.(這裡有一隻狗,這是牠的尾巴。)

希望答到你問題啦^^

"it's" means "it is"
and "its" means something owns something.