表达不清楚用英语怎么表达？

He wants to express his deep sympathy to the family.

他想对那家人表示自己深切的同情。

You have to pay a high premium for express delivery.

快递须付高额的附加费。

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

对你所做的一切，我怎么才能表达谢意？