[請益] 請教幾個特殊句型
剛在Reader's Digest上看到一篇文章，裡面有兩個句子 句型結構比較少見
1.Could global warming be making you fat?
使用could be ing的句型 網路上說有助動詞+be ing有強調意思，是這樣嗎?
或有其他解釋呢?
2.Phelps would have to have been aggressively swimming during every waking
hour to keep from gaining weight.
would have to have been ving 是假設語氣用法嗎? 不太清楚這邊的意思
煩請厲害的大大解惑一下~ 謝謝!
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