the singer and dancer ___the party this evening空格里填 is to attend 但为什么不能用 is about to attend 有什么不一样?错在哪里?

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thesingeranddancer___thepartythisevening空格里填istoattend但为什么不能用isabouttoattend有什么不一样?错在哪里?thesingerand

the singer and dancer ___the party this evening空格里填 is to attend 但为什么不能用 is about to attend 有什么不一样?错在哪里?
the singer and dancer ___the party this evening
空格里填 is to attend 但为什么不能用 is about to attend 有什么不一样?错在哪里?

the singer and dancer ___the party this evening空格里填 is to attend 但为什么不能用 is about to attend 有什么不一样?错在哪里?
be to 表示将来时 = will
be about to正好,正要做某事...比如 I'm about to open the door when the phone ringing.我正要开门的时候电话响了