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پرسش مربوط به استفاده از "for" و "since" در زبان یازدهم است. در اینجا پاسخ‌ها به این صورت خواهد بود: 1. My sister has been sick **for** a long time. She has been in the hospital **since** January. 2. Nobody lives in those houses. They have been empty **for** many years. 3. I have been interested in computer technology **for** four years. 4. My father is in his office. He has been there **since** 8 o’clock. 5. He has stopped smoking **since** the birth of his baby. 6. My parents have been married **for** 20 years. 7. We have lived in Shiraz **since** ten years ago. 8. We have known each other **for** 15 years. 9. I've painted two rooms **since** lunchtime. 10. He has been in China **for** two weeks. این پاسخ‌ها بر اساس قواعد استفاده از "for" برای مدت زمان و "since" برای شروع زمانی است.