This section is from the book "Lessons In English", by Chestine Gowdy, Lora M. Dexheimer. Also available from Amazon: Lessons in English.
Assert the present happiness of Mary. Assert her past happiness. What verb did you use forms of?
Assert her future happiness. What did you use instead of a verb?
Assert praising of yourself as a present act, using a form of the verb praise only. Assert it as a past act, using a form of the verb praise only. Assert it as a future act. What did you use instead of a verb?
 
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