Bonsoir
3- You're not very tall. Your brother is taller.
4- David doesn't work very hard. I work harder.
5- Yours is more confortable.
6- My plan is better.
7- The blue ones are nicer.
8- Your bag is heavier.
9- I'm more interested in history.
10- It was warmer yesterday.
11- The others tasted better.
12- Paris is more beautiful.
13- Have you got a sharper one ?
14- In the past we were (much) more polite.
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bonne soirée ☺☺☺