Not sure what you mean. Is this ESL-speak? : I know what to do in order to kill a fly.
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how would you explain why it's not (2) to your students?No infinitives of purpose after verbs of mental state or perception. If there's only a mental state and no true agent or action, can there be a purpose? Certain facts in the world don't (indeed, can't) have purposes.
CalifJimNo infinitives of purpose after verbs of mental state or perception. IYes, I'd try to generalize it that way too. But this can work, can't it?
*I know these facts in order to pass the exam.
But this can work, can't it?Yes. That works. Here the modal should implies that some action is advisable, and that action is knowing the facts. But knowing facts is not an action, so the whole structure must be anomalous. Or is it?
I should know these facts in order to pass the exam.