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Its and it’s

It’s — always short for “it is.”
Its — always means “of it” or “belonging to it.”
It’s hot today.  My elephant hates its saddle.

Breath(e)

When you take a breath, you breathe.
Breath is a noun, breathe is a verb.

Do not say, “I like to breath fresh air.”

Rein and reign

You control a horse with reins. You can rein it in, or “give it the reins” to let it run.
A king or queen reigns; his or her time as monarch is the reign.