I am no teacher!
You can use your being in the passive progressive form:
The streets are being built.
The streets were being built.
Here you need being to form the passive.
When you ask for a fact in the past, use the simple past.
As always, correct me when I am wrong
I don't have the right size drill bit, but this might work. -- It could serve the purpose it was needed for.
If I am even more doubtful, I might change it to "might just about" work. I don't really have the right color lipstick to go with that dress, but this color might just about work.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.