7. My mother is taller than me.
8. Mary is more intelligent than Jack.
9. That exercise is not as easy.
10. This hotel is the most comfortable

7. I am shorter than my mother.
=> My mother  is taller than me.
8.  Jack is not as intelligent as Mary
=> Mary  is more intelligent than Jack.
9. This exercise is easier than that one.
=> That exercise is not as easy. as this one
10. No hotel in the city is as comfortable as this.
=> This hotel is the most comfortable in the city