I take the bus to work because it's quicker than going by car.
Correct.
I prefer visiting Paris in the winter. It's less crowded than in the summer.
Correct.
Now that I've tried them on, these shoes are comfortabler than I thought they were going to be.
more comfortable
In this photo, you look more young than your sister.
younger
Restaurants in New York are more expensive than in my city.
Correct.
Anne's not as tall as Susie, but she's thinner.
Correct.
German trains are moderner than British ones.
more modern
April is shorter than Paul, but he isn't as fast as she.
as her.
Sean's the worse actor in the group, but he's the best singer.
the worst
It's usually hoter here in June than it is in May.
hotter
Personally, I think Barcelona is the best city of the world.
in the world
Which sofa is more cheaper? The blue one or the red one?
cheaper
Did you go to the same school than your brother?
the same school as
