这本书提供了英语语法和用法的全面指南。

This book provides a comprehensive guide to English grammar and ___usage.

这就是为什么我无法解决所有英语用法的问题。

That is why I couldn't solve all my problems with English ___usage.

技术术语的用法在不同领域各有不同。

The ___usage of technical terms varies across different fields.