Could you help me with this sentence which I am confused about?
(1)Once cooled sufficiently the bricks can be packaged and are then ready for delivery.
(2)Once you finish your homework you can watch TV.

(1)My confusion is why the 1st sentence is not written like 'onced being cooled sufficiently .....', because the bricks are cooled(passive forms). In the above sentence, is 'being' omitted or there should not be the 'being' there.
(2)For the 2nd sentence, if I can write like this 'once finishing your homework you can watch TV'. Like the 1st sentence, omitting the subject.

Could you explain this to me?
Really thanks for you help~~

Question

Could you help me with this sentence which I am confused about?
(1)Once cooled sufficiently the bricks can be packaged and are then ready for delivery.
(2)Once you finish your homework you can watch TV.

(1)My confusion is why the 1st sentence is not written like 'onced being cooled sufficiently .....', because the bricks are cooled(passive forms). In the above sentence, is 'being' omitted or there should not be the 'being' there. 
(2)For the 2nd sentence, if I can write like this 'once finishing your homework you can watch TV'. Like the 1st sentence, omitting the subject.

Could you explain this to me?
Really thanks for you help~~

Answer

1. Once (they have been) cooled, ...
This is a reduced passive construction. In this case, the tense is present perfect because of the meaning, but it works with every tense. We can do this because the subject is the same in both clauses (the bricks).

2. The second sentence is not passive so we can't do the same. We could make the first clause passive "Once the homework has been finished,..." But we can't reduce it because the subject of each clause is different.

Answers · 2

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