future332 All they did was complain about the weather, the food and the room. Correct. All is followed by the infinitive (complain) in sentences like yours.
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future332All they did was complain about the weather, the food and the room.Correct. All is followed by the infinitive (complain) in sentences like yours.
future332All they did was complained about the weather, the food and the room.Ungrammatical, because complained isn't an infinitive.
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