在这里面,may只是表示不确定,对应last night的是telephoned的这个动作,所以这里用may是可以的,同样can,could 也不完全是对应的过去式,could还可以表示语气的强弱,希望对你有用!
he may have telephoned last night,but i'm not sure.may的过去式不是
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