OXFORD PRACTICE GRAMMAR-16 sau đây là giáo trình lý thuyết tiếng anh và bài tập áp dụng từ cơ bản đến nâng cao , nhằm giúp các bạn có thể tự mình ôn tập và củng cố thêm về nền tảng kiến thức môn Anh văn , tự tin đạt kết quả tốt trong kỳ thi ngoại ngữ | OXFORD PRACTICE GRAMMAR 16 THE PRESENT PERFECT CONTINUOUS A Introduction We use the present perfect continuous for an action waiting . The action happens over a period of time for twenty minutes . Here the period lasts up to the present - they are still waiting now. B Form The present perfect continuous is the present tense of have been an ing-form. I you we they have been waiting OR I you we they ve been waiting he she it has been waiting OR he she it s been waiting NEGATIVE QUESTION I you we they haven t been waiting have I you we they been waiting he she it hasn t been waiting has he she it been waiting We ve been standing here for ages. It has been raining all day. Have you been waiting long Our team hasn t been doing very well lately. C Use We use the present perfect continuous for an action over a period of time leading up to the present see A . In these examples the action is still going on. We ve been waiting here for twenty minutes. We re waiting now. Listen. That burglar alarm has been ringing since eight o clock this morning. We must use the perfect in these situations. NOT We wait here for twenty minutes OR We re waiting-here for twenty-minutes. We can use the present perfect continuous to talk about repeated actions up to now. Natasha has been playing the piano since she was four. We can also use it to talk about an action which ends just before the present. I ve been swimming. That s why my hair is wet. D For since how long and recently We can use the present perfect continuous with for and since see Unit 121 . My sister has been staying with me for three weeks now. You ve been playing on that computer since seven o clock. We use how long in questions. How long have you been waiting Note also recently and lately. These both mean in the last few days or weeks . I haven t been feeling very well recently. What have you been doing lately 17 Present perfect continuous or simple 121 For and since 16 EXERCISES 1 Form B Put in the verbs. Use the present .
