You can read about the correct pronunciation on my older post about the most difficult vowel sound for ESL speakers.
As I've already explained the pronunciation in a previous post, here we will focus a tiny bit more on pronunciation and then on the grammar.
Pronunciation: HIS vs. HE'S
- HIS is pronounced with the (I) sound according to the International Phonetic Alphabet (IPA) (as in it, live, ship, tin, bin, etc...)
- HE'S is pronounced with the (i:) sound according to the IPA, (as in see, free, tea, leave, etc...)
Again, if you want to learn more about the difference between (I) and (i:), visit my old post clicking on the link above.
Grammar: HIS vs. HE'S
HIS is a possessive adjective (or a possessive determiner):
We use these possessive adjectives with nouns.
- Ex. That is not your book! That's his book!
- Ex. His i-Phone is older than my i-Pad.
HE'S is a contraction.
- HE'S=HE IS
- Ex. He's my best friend!
- Ex. He's my colleague from France who has just joined our team.
- Ex. He's my puppy, and she's my cat.
I hope this clarifies the confusion between he's and his. Remember: there are two differences, one is the pronunciation and the other is the grammar. I hope this helps!