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2 Mohammad Mahfooz Hussain2. Perfect Continuous Tenses (Using been):These tenses focus on the duration of an ongoing action that started in the past and continues up to another point in time.%u2022 Present Perfect Continuous (has/have been):o He has been waiting for the bus for thirty minutes.o We have been working on this project since Monday.%u2022 Past Perfect Continuous (had been):o The streets were flooded because it had been raining all night.%u2022 Future Perfect Continuous (will have been):o By December, they will have been living in this city for five years.3. After Verbs of Perception:Verbs of perception are verbs that describe the use of the five physical senses. Common examples include see, hear, feel, watch, notice, smell, and observe.When you talk about seeing, hearing, or feeling someone do an action, the present participle is used to show an action in progress.Grammatically, sentences utilizing this structure are classified as containing a non-finite object complement. The present participle acts as a complement that gives more information about what the direct object is doing.%u2022 Syntax:Subject + Verb of Perception + Direct Object + Present Participle (V-ing)o I saw him stealing the car.