【論点28：準動詞部分を節へと解凍してしまえば既知の構文に還元可能】

① She did not know which way to go. = She did not know which way she should go. ② I don’t know what to do. = I don’t know what I should do. ③ Tell me how to drive. = Tell me how I should drive. ④ Let me know when and where to meet next time. ⑤ We are fascinated by the mysterious migration of the birds. What tells them when to leave and where to go? ⑥ Birds have wings with which to fly away from danger. = Birds have wings with which they can fly away from danger. ⑦ This is the only acceptable circumstance under which to break the contract.