ほど賢くない

トムはメアリーほど賢くないよ。

Tom isn't as smart as Mary.

私は彼ほど賢くない。

I'm not as smart as he is.

きっとトムほど賢くないだろうな。

I’m probably not as smart as Tom.

彼は兄ほど賢くない。

He isn't as smart as his older brother.

彼らはこのものを理解できるほど賢くない。

They aren't smart enough to understand this.