Present perfect continuous (Difficult) Quiz Home › IELTS › IELTS English Grammar › Present perfect continuous (Difficult) 📝 IELTS – English Grammar – Present perfect continuous – Difficult 20 questions · 15 min timer · Explanations included · Free 1. Identify the error in this sentence: 'They have been waiting for you since two hours.' The use of 'since' is incorrect. The verb form 'have been waiting' is incorrect. The sentence is correct. The use of 'for' is incorrect. None 1 out of 14 2. Which of the following sentences uses the present perfect continuous tense correctly? We have been known each other for years. We have been knowing each other for years. We have known each other for years. We have been meeting each other for years. None 2 out of 14 Loading questions... 3 out of 14 Loading questions... 4 out of 14 Loading questions... 5 out of 14 Loading questions... 6 out of 14 Loading questions... 7 out of 14 Loading questions... 8 out of 14 Loading questions... 9 out of 14 Loading questions... 10 out of 14 Loading questions... 11 out of 14 Loading questions... 12 out of 14 Loading questions... 13 out of 14 Loading questions... 14 out of 14 Click Submit to see your final score! Previous Start Quiz Next Time's upTime is Up!