7) Explain usage and formation of Present Perfect Continuous tense (affirmative, negative and interrogative) and make up sentences
The Present Perfect Continuous tense is used to describe an action that started in the past, has continued until the present moment and may still be ongoing. It is formed using "have/has been" + present participle (-ing).
Affirmative:
Subject + have/has been + present participle
Example: She has been working on her project for two hours.
Negative:
Subject + have/has not been + present participle
Example: He has not been practicing his guitar lately.
Interrogative:
Have/Has + subject + been + present participle?
Example: Have you been studying for your exam?
8) Explain usage and formation of Past Perfect tense (affirmative, negative and interrogative) and make up sentence
The Past Perfect tense is used to describe an action that was completed before another action in the past. It is formed with the auxiliary verb "had" and the past participle of the main verb.
Affirmative:
Subject + had + past participle
Example: She had finished her homework before she went to bed.
Negative:
Subject + had + not + past participle
Example: He had not studied enough before the exam.
Interrogative:
Had + subject + past participle + ?
Example: Had they already left before we arrived?
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