[請益] must be v.s must have been

看板Eng-Class作者 (新的開始)時間12年前 (2013/06/04 07:29), 編輯推噓1(1推 0噓 8→)
留言9則, 3人參與, 最新討論串1/1
想請教大大一個問題，下列這兩句話哪一句才是對的呢? His parents must be very happy since he won the first grade. His parents must have been very happy since he won the first grade. 非常謝謝您! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 106.1.145.36
推
06/04 12:59, , 1F
must have been；must have Vpp→對過去的肯定推測。
06/04 12:59, 1F
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06/04 13:03, , 2F
must be；must V原→對現在的肯定推測。
06/04 13:03, 2F
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06/04 13:04, , 3F
看你覺得他爸媽是他得獎後是現在爽還是過去爽囉～
06/04 13:04, 3F
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06/04 18:09, , 4F
謝謝!所以這裡的since如果解釋成自從，也可以用must
06/04 18:09, 4F
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06/04 18:10, , 5F
must be嗎? 會不會涉及到要使用完成式表達一直高興?
06/04 18:10, 5F
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06/04 18:45, , 6F
這邊的 since 是「因為」不會是自從
06/04 18:45, 6F
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06/04 18:45, , 7F
基本上 must be 比較自然
06/04 18:45, 7F
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06/04 18:46, , 8F
因為這是一個「推測」，而不是陳述
06/04 18:46, 8F
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06/05 18:57, , 9F
Thank you so much :)
06/05 18:57, 9F
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