The present perfect continuous or progressive tense is a verb tense used for a situation that describes an ongoing action or activity while emphasizing the length or period of time. A present perfect continuous verb uses the auxiliary verb have/has been and the present participle or -ing form of the main verb. The correct answer is "have been waiting has crashed". This is because the sentence is in the present perfect continuous tense, indicating an action that started in the past and is still ongoing. "Have been waiting" is the present perfect continuous form of "wait", indicating that the waiting started in the past and is still happening. To sum up, we use the future perfect continuous tense to talk about the amount of time something took that was ongoing from the present until the future. We can replace this tense with the future perfect tense to give the same amount of time, but we are then giving the overall time it took and not emphasizing the continuous action like (waiting The Present Perfect Continuous Tense is a grammatical structure that expresses actions that began in the past, are ongoing in the present, and are expected to continue into the future. It emphasizes the duration or the ongoing nature of an action or event. Present Perfect Continuous Uses. The activity is finished and we can see the results of it. I have been cleaning the car ( The car is clean) I have been preparing dinner (The dinner is ready) We use the present perfect continuous for a single activity that began at a point in the past and is still continuing. I have been reading your book ( I 4Fmmdm.

present perfect continuous tense of wait