表達不清楚用英語怎麼表達？

He wants to express his deep sympathy to the family.

他想對那家人表示自己深切的同情。

You have to pay a high premium for express delivery.

快遞須付高額的附加費。

How can I ever express my thanks to you for all you've done?

對你所做的一切，我怎麼才能表達謝意？