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He can say whatever/whoever he wants.
She can take whenever/whatever she wants from the bridge.
Whoever/Whenever ate the last piece of cake, please buy some more.
There are three bikes at my house, and I can drive however/whichever of them I want.
Whenever/Whoever I arrive home, supper is waiting for me on the cooker.
I always feel at home wherever/whichever I travel in the world.
Wherever/Whenever she puts her keys, she always forgets where they are.
I don’t know who did it but whichever/whoever it was is in great trouble.
You can take whatever/whichever of these flowers you like.
You need to report any accidents, however/whenever small they may seem to be.