I am (friendly) than my sister!
friendlier
Train is the (safe) kind of transport!
safest
Tokyo is the (expensive) city in the world!
most expensive
Irkutsk is (cheap) than Moscow!
cheaper
Cats are (nice) than snakes.
nicer
My book is (interesting) than your book!
more interesting
My room is the (clean) room in our house!
cleanest
My dad is the (strong) in the world!
strongest
My mum is the (good) in the world!
best
Elephants are (large) than cats.
larger
Cars are (dangerous) than planes!
more dangerous
My sofa is the (comfortable) sofa in the world!
most comfortable
This girl is the (beautiful) in the class!
the most beautiful