Tian helped her mother cook the dinner yesterday evening.cook为什么不要加ing

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Tianhelpedhermothercookthedinneryesterdayevening.cook为什么不要加ingTianhelpedhermothercookthedinneryester

Tian helped her mother cook the dinner yesterday evening.cook为什么不要加ing
Tian helped her mother cook the dinner yesterday evening.cook为什么不要加ing

Tian helped her mother cook the dinner yesterday evening.cook为什么不要加ing
help sb do sth.固定形式!