tailieunhanh - fundamentals_english_grammar_3rd_split_12

Tham khảo tài liệu 'fundamentals_english_grammar_3rd_split_12', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Al and Ann are in their car right now. They are driving home. It is now four o clock. a They have been driving since two o clock. b They have been driving for two hours. They will be home soon. The PRESENT PERFECT PROGRESSIVE talks about how long an activity has been in progress before now. Note Time expressions with since as in a and for as in b are frequently used with this tense. STATEMENT havelhas been -ing c How long have they been driving QUESTION FORM havelhas subject been -ing COMPARE the present progressive and the present perfect progressive. d Po is sitting in class right now. The present progressive describes an activity that is in progress right now as in d . It does not discuss duration length of time . INCORRECT Po has been sitting in class right now. Po is sitting at his desk in class. He sat down at nine o clock. It is now nine-thirty. e Po has been sitting in class since nine o clock. f Po has been sitting in class for thirty minutes. The PRESENT PERFECT PROGRESSIVE expresses the duration length of time of an activity that began in the past and is in progress right now. INCORRECT Po is sitting in class since nine o clock. g CORRECT I ftnowYoko. h INCORRECT 1 am knowingYoko. i CORRECT I have known Yoko for two years. j INCORRECT I have been knowingYoko for two years. Reminder Non-action verbs . know like own belong are not used in any progressive tenses. In i With non-action verbs the present perfect is used with since or for to express the duration of a situation that began in the past and continues to the present. See Chart 1-6 Non AcricitiVerbs p. 17. 98 CHAPTERS r Directions complete the sentences. Use the present progressive or fne present perfect progressive. 1. I sit w SÌH-Ìhg in class right now. I sit U AV e been sii ihg here since one o clock. 2. Kate is standing at the corner. She wait for the bus. She wait for the bus for twenty minutes. 3. Scott and Rebecca talk on the phone right now. They talk . on the phone for over an hour. 4. .

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