All are OK except this one. >I’ve observed that only when I punished him _______ he take me seriously. (should/ does /make/must) No.
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All are OK except this one.
4.>I’ve observed that only when I punished him _______ he take me seriously. (should/does/make/must)
No. I think you meant to type 'punish', not 'punished'. Only 'punish' fits with 'does.