Question

fogs have hidden it from us until then (begin with 'it'...)​

Answer 1

Answer:

it has been hidden by fogs from us until then

Answer 2

The correct form of the sentence should be:

It has been hidden by the fogs from us until then.

* In case of the given sentence, the 'fogs' is the subject and the sentence lays its focus on it. The word 'it' refers to something in particular, and acts as the main object( direct object).

* However, 'us' is also another object( indirect object) in the sentence.

* In the case of the new sentence, 'it' becomes the new subject and accordingly the sentence gets reversed.

* The main object here is 'fogs' whereas the other object is 'us'.