If only the committee(accepted)the proposal and them into effect as soon as possible.为什么是accepted?而不是accepte或者have accepted或者should accept?

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If only the committee(accepted)the proposal and them into effect as soon as possible.
为什么是accepted?而不是accepte或者have accepted或者should accept?

if only:要是.表示虚拟语气,动词的时态要用过去时,be动词一律用were.如果动作本身就发生在过去,那就要用过去完成时.
如:If only I were [was] better looking.