新概念3有个句子不太明白experts confirmed that a puma will not attack a
新概念3有个句子不太明白 experts confirmed that a puma will not attack a human being unless it is cornered.为什么这里will不用过去式啊 The experts were now fully convinced that the animal was a puma 这个句子你看都用过去式
experts confirmed that a puma will not attack a human being unless it is cornered. 这里a puma will not attack a human being unless it is cornered阐述的是客观规律,不需要改变时态.
a puma will not attack a human being unless it is cornered 这个是当作真理,客观事实,所以不用改变时态。对所有的 puma 都适用。 that the animal was a puma 这个只是对那里出现的一个动物,不是普遍适用的真理。所以用一般过去时。