4. Open the brackets using Present Perfect or Present Perfect Continuous 1) We (not to see) them for three months. 2) We (to be) married since 1977. 3) She (to be) ill since last week. 4) They (to be) here since two o’clock. 5) How long Mary and Ann (to know) each other? 6) I (to try) to understand you for half an hour. 7) We (not to see) them for three months.

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