Condition Clauses: If, Unless, and Provided That

Help the veteran time traveler explain the golden rule of the time machine to the rookie: *Whatever you do, do not touch the red button!* 

Select ALL the sentences that correctly state this warning.

- [x] If you press the red button, the timeline will collapse.
- [x] The timeline will collapse unless you keep your hands off the red button.
- [ ] Provided that you press the red button, the timeline will remain perfectly stable.
- [ ] Unless you press the red button, the timeline will collapse.

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The correct answers are **If you press the red button, the timeline will collapse** and **The timeline will collapse unless you keep your hands off the red button**.

> Condition clauses can appear at the beginning or the end of a sentence. 

>

> Let's look at the distractors:

> - "Provided that you press..." means the timeline is *only* safe if you press it. This is the exact opposite of the warning!

> - "Unless you press..." means "If you do *not* press the red button, the timeline will collapse." This implies you *must* press it to save the timeline, which is also dangerously incorrect.
