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？