Is that so?

是吗？

A: Tom is coming over to my house today.

B: Is that so? I've never met him.

A: 今天汤姆要来我家。

B: 是吗？我从来没见过他。

A: My favorite food is pizza.

B: Is that so? I don't like pizza at all.

A: 我最喜欢的食物是披萨。

B: 是吗？我一点也不喜欢披萨。