How do you write a sentence using the comparative form?

Here are some sentences that contain the comparative form:

She is taller than her sister.

He's happier than I've ever seen him before.

Grandma would feel safer if she had a dog.

Could you speak up a little louder please?

Is McDonald's busier than Burger King?

February is much shorter than January.

Is geometry harder than algebra?

Is ketchup thicker than taco sauce?