They are (happy) kids I know.
the happiest
She is the (creative) person in our team.
the most creative
My new phone is (expensive) than the old one.
more expensive
Today homework is (big) than iy was yesterday.
bigger
Today is (cold) day of the year.
the coldest
His girlfriend is (beautiful) than mine.
more beautiful
This is (small) box I've ever seen.
the smallest
My house is (large) than hers.
larger
That book is (interesting) than the film.
more interesting
That was (dangerous) road I’ve ever driven on.
the most dangerous