Is there any mistakes? Help :)
1. (Adam is shorter than Jerry)
Jerry isn't as short as Adam.

2. (Your bag is nicer than mine)
My bag isn't as nice as your.

3. (Tokyo is bigger than London)
London isn't as big as Tokyo.

4. (Tennis is more popular than cricket)
Cricket isn't as popular as tennis.

5. (Children learn languages faster than adults)
Adults don't as learn languages fast as children.

6. (I work harder than you)
You don't as work hard as me.

7. (England played better than France)
France didn't as play well as England.

Question

Is there any mistakes? Help :)
1. (Adam is shorter than Jerry)
Jerry isn't as short as Adam.

2. (Your bag is nicer than mine)
My bag isn't as nice as your.

3. (Tokyo is bigger than London)
London isn't as big as Tokyo.

4. (Tennis is more popular than cricket)
Cricket isn't as popular as tennis.

5. (Children learn languages faster than adults)
Adults don't as learn languages fast as children.

6. (I work harder than you)
You don't as work hard as me.

7. (England played better than France)
France didn't as play well as England.

Answer

ARE there any mistakes ;)
2: YourS
5: ... learn languages as fast as...
6: ...work as...
7: ....play as...

Answer

2. My bag isn't as nice as yours

5. Adults don't learn languages as fast as children.

6. You don't work as hard as me.

7. France didn't play as well as England.

"As" often comes after the verb in sentences like these. 
Examples:
"(Verb) as (adjective) as..."
"Run as fast as..."
"Cook as well as..."
"Sleep as often as..."