as old as
same age as
The stamps on the left are more expensive than( those) on the right
The grass in our garden is longer than(that) in theirs
Dick is two years older than Mary( old-> older)
The Amazon is the second longest river in the word( long-> longest)
Jane writes much better than Tom( more -> much)
A car is much more expensive than a bike ( very-> much)
The teachers in our school are more than(those ) in theirs
注：在句中的括号里的词是加上去才正确的,句末的括号里的词是说明原句中的词改为后面的才对