“ Watch the milk and don’t let it boil over,” he said to me. ( Indirect speech )
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There was a storm, so they couldn’t arrive earlier. ( Subjunctive mood )
“ Have you heard from your mother recently?” she asked me. ( Indirect speech )
They must have made fun of him for that. ( Passive voice )
当有价值条件取代机体经验作为生活的向导时,人即成为()。