1. Did Asif open the window?auxiliary verb did - subject - infinite form of the main verb - rest(i)<br><br>

2. Did she walk home?auxiliary verb did - subject - infinite form of the main verb - rest(i)<br><br>

3. Did you work in the ________?<br><br>

4. Did you sing a song?auxiliary verb did - subject - infinite form of the main verb - rest(i)<br><br>

5. Did she sit on a chair?auxiliary verb did - subject - infinite form of the main verb - rest(i)<br><br>

6. Did you visit the castle?auxiliary verb did - subject - infinite form of the main verb - rest(i)<br><br>

7. Did ____ lock the door?<br><br>

8. Was she happy?If the verb is a form of be, we do not use an auxiliary, but place the form of be before the subject.(i)
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9. Did Greg kick the ball?auxiliary verb did - subject - infinite form of the main verb - rest(i)<br><br>

10. Did the car stop at the corner?auxiliary verb did - subject - infinite form of the main verb - rest(i)
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http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?06