sat语法题--from princetonsometimes the sun shines on the lake in such a way as to create the illusion that we could sail a boat off the edge of the Earth.could的时态为什么是对的.和shines对应不应该是can么?

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sat语法题--from princetonsometimes the sun shines on the lake in such a way as to create the illusion that we could sail a boat off the edge of the Earth.could的时态为什么是对的.和shines对应不应该是can么?

sat语法题--from princetonsometimes the sun shines on the lake in such a way as to create the illusion that we could sail a boat off the edge of the Earth.could的时态为什么是对的.和shines对应不应该是can么?
sat语法题--from princeton
sometimes the sun shines on the lake in such a way as to create the illusion that we could sail a boat off the edge of the Earth.
could的时态为什么是对的.和shines对应不应该是can么?

sat语法题--from princetonsometimes the sun shines on the lake in such a way as to create the illusion that we could sail a boat off the edge of the Earth.could的时态为什么是对的.和shines对应不应该是can么?
could和can都可以表示现在（could也可以表示过去）
但could语气没有can肯定
就这么一点差别~

当然可以了，could和can相比不但表示的可能性较小，而且语气相对比较缓和了，要注意他们的用法了

应该是虚拟语气吧。sail a boat off the edge of the Earth不是一个真实的情况，而是由sun shines on the lake而created出来的illusion.所以是虚拟语气。另外，建议你练sat语法以OG和真题为主，效果比PR好。Good Luck!

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