0Your three teachers must all be from the same school. The present participle surely sounds better than the infinitive in this case. It seems to me that their argument against "ing" could be applied as well to the infinitive.
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01cite10Avangi12cite10I hope I didn't mislead you with my first reply. My understanding was that in both examples, 1 & 2, there were two solutions. 11sup10Both were grammatically correct,12sup10 but your teachers only allowed one in each case, because they wanted you to follow the example of the active senten