1.He isn't as tall as I am/me.
2. She isn't as beautiful as her morther is/her mother.
3. His close friend isn't as intelligent as her is/her morther.
4. He doesn't run as fast as I run/I do/me.
5. She doesn't cook as well as her mother cooks/ her mother does/her mother.
6. He doesn't study English as well as his plays soccer/playing soccer/soccer.