Active to passive: 'has to / is to' + verb -> 'has to / is to be' + past participle

1. A.
   Fifty-one cakes will be baked by Sanyukta for the anniversary party.
2. B.
   Fifty-one cakes had to be baken by Sanyukta for the anniversary party.
3. C.
   Fifty-one cakes have to be baked by Sanyukta for the anniversary party.
4. D.
   Fifty-one cakes has to be baked by Sanyukta for the anniversary party.

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1. A.
   In this matter, little is to be said.
2. B.
   Little has to be said in this matter.
3. C.
   In this matter, little must be said.
4. D.
   Little had to be said in this matter.

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1. A.
   The road to be closed by the authorities.
2. B.
   The road is to be closed by the authorities.
3. C.
   The road has to be closed by the authorities.
4. D.
   The road will be closed by the authorities.

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