Dashes are used to give emphasis to written ideas and are typed by using two hyphens. They should be used sparingly.
Use a dash to show a break in thought or sentence structure. Example: He had tried to change–you’re not even paying attention!
Instructions: Use dashes where they are needed in the following sentences.
1. We will invite Susan she is the new girl next door to our party.
2. The dog slid on the vinyl his nails acting like skates and crashed into the trash can.
3. When our stockpile was sold indeed, dumped for surplus all our sales were compromised.
4. Today has been but I will not bore you with my troubles.
5. Let me tell you about watch where you are going!
–For answers scroll down.
1. We will invite Susan–she is the new girl next door–to our party.
2. The dog slid on the vinyl–his nails acting like skates–and crashed into the trash can.
3. When our stockpile was sold–indeed, dumped for surplus–all our sales were compromised.
4. Today has been–but I will not bore you with my troubles.
5. Let me tell you about–watch where you are going!
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from Daily Grammar Lessons Blog http://dailygrammarlessons.blogspot.com/2016/05/lesson-426-mechanics-punctuation-dashes.html