
without/but for 虚拟语气中 针对 过去 现在 将来 主句用什么结构?谢谢!
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针对将来,主句用were to 结构和should /would/ could/might +动词原形。
针对现在,should /would/ could/might + have done
针对过去,should /would/ could/might + have done
针对现在,should /would/ could/might + have done
针对过去,should /would/ could/might + have done
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