Past Perfect Tense| How to Convert Affirmative Sentence into its Negative and Interrogative Forms

Learn in the simplest way that how can you convert the given affirmative sentence of past perfect tense into its negative and interrogative forms. the formulas for writing affirmative, negative and interrogative sentences are given in this video which are useful in conversion. the examples will help you understand the topic more clearly. the exercise and its solution given at the end of the lecture will also be very helpful for the students.