Make sentences. Use isn't/aren't as.....as.
Exsmple 1. Alex isn't as old as David.
1. Alex is younger than David.
2. You're shorter than Rosie.
3. Keyboards are cheaper than printers.
4. A bicycle it's slaver than a car.
5. Cheetahs are smaller than lions.
6. The science exam it's easier than the maths exam.