not as A as B :　BほどAではない

1. Osaka isn't as big as Tokyo.
（大阪は東京ほど大きくない）

2. This drink isn't as sweet as the other one.
（この飲み物は他の飲み物ほど甘くない）

3. That action movie isn't as good as the previous one.
（あのアクション映画は、前回ほど面白くない）

4. His writing ability is as good as any famous author.
（彼の文章力はどの有名な作家と同じくらい素晴らしい）

5. This problem isn't as difficult as you think.
（この問題はあなたが考えているほど難しくない）