2 Changed "I did not have this idea unless saw that entry.." to subjunctive & conditional.
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The preposition is optional there. Said that, it depends on the writer's style.

OALD has an entry for it:

I've been waiting (for) 20 minutes.


However, I didwould not have had this idea unless saw, had I not seen that entry some months back. Still, I prefer using the preposition to satisfy myself!

The preposition is optional there. Said that, it depends on the writer's style.

OALD has an entry for it:

I've been waiting (for) 20 minutes.


However, I did not have this idea unless saw that entry some months back. Still, I prefer using the preposition to satisfy myself!

The preposition is optional there. Said that, it depends on the writer's style.

OALD has an entry for it:

I've been waiting (for) 20 minutes.


However, I would not have had this idea, had I not seen that entry some months back. Still, I prefer using the preposition to satisfy myself!

1
source | link

The preposition is optional there. Said that, it depends on the writer's style.

OALD has an entry for it:

I've been waiting (for) 20 minutes.


However, I did not have this idea unless saw that entry some months back. Still, I prefer using the preposition to satisfy myself!