Cześć mam to przerobienia zdanie ze strony czynnej na bierną:
If
we add lead to molten tin and the
cool the mixture,
we find that the freezing point of the mixture is lower than freezing point of both lead and tin.
Nie za bardzo wiem jak się do tego zabrać według mnie można by zrobić tak: if lead to molten tin is added and then cool the mixture by us, the freezing point of the mixture is found by us is lower than the freezing point of both lead and tin