"Lesson 80: How? contains instruction on ways to describe:

1. the style, or way, of doing something: the manner 2. the method of doing something. There is one practice exercise so that you can reinforce the skills you just learned.

This lesson is part of the Athabasca University Mobile ESL course."

Part of Athabasca University's Mobile ESL Course, Exercise 80.1 tests your knowledge of when to use by, to, or with.

"Lesson 81: Purpose and Use contains instruction on ways to show why you did something, why something exists, or what its use is. There are two practice exercises so that you can reinforce the skills you just learned. This lesson is part of the Athabasca University Mobile ESL course."

Part of Athabasca University's Mobile ESL Course, Exercise 81.1 tests your knowledge of word order.

Part of Athabasca University's Mobile ESL Course, Exercise 81.2 tests your knowledge of when to use by, for, or to.

"Lesson 82: Reason and Consequence contains instruction on ways to connect two ideas when one idea is the cause (the reason why) and the other is the result (the consequence). There are three practice exercises so that you can reinforce the skills you just learned. This lesson is part of the Athabasca University Mobile ESL course."

Part of Athabasca University's Mobile ESL Course, Exercise 82.1 tests your knowledge of when to use because, so, or as a result.

Part of Athabasca University's Mobile ESL Course, Exercise 82.2 tests your knowledge of when to use so or such.

Part of Athabasca University's Mobile ESL Course, Exercise 82.3 tests your knowledge of how to connect ideas.