Hi, I was trying to get some info about structures for modals of deduction, speculation or certainty, and I found the following info: « Will and won't / will not + have + past participle are used for past certainty (compare with present use of 'will' above): The parcel will have arrived before now. So, in this context, the "will" structure means... a past action?
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CliveYes. It predicts that the action has already happened, in a context where the action has some result in the present situation.
eg He will have arrived home by now. So, you can call him at his home phone number.