Lesson 57: Perfect Tenses - Negatives & Questions - English Grammar Practice Videobook Exercises
Channel: Guy Reloaded
Date: 2020-06-23

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Grammar 57: Perfect Tenses - Negatives & Questions

Form negatives with the present perfect and present perfect continuous tenses by placing not after have/has. The contractions haven’t and hasn’t are generally used.
• They have not worked here.
• They haven’t worked here.

• It has not been snowing.
• It hasn’t been snowing.

Form yes-no questions with these perfect tenses by placing have/has before the subject.
• Have they worked here?
• Has it been snowing?