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Please look at the following sentences 

Are the following sentences correct at all? Is there any scenario or context where they are right? I know I could easily use simple past, but I want to know if the following usage is right or not? If yes, then in what is the difference between them and simple past usage of these sentences?

1. They were fighting Nazis for three days.

2. I was studying for six hours yesterday.

3. I was working there since I graduated from school.

4. Dad was working in his garden all morning.

5.During the mid-50s, real estate speculators were buying all the swampland in Central Florida, and innocent people were investing all their money in bogus development projects.

Thanks
Comments  
GargieAre the following sentences correct at all? Is there any scenario or context where they are right?
Only #3 sounds wrong in all situations.
Thanks for your reply. But could you please tell the reason why #3 would be wrong while other are right? If #3 is wrong, then should all other be not wrong, too? Because the tense is past progressive and we have used 'for' and 'since' in the sentences.

Thank you.
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GargieBut could you please tell the reason why #3 would be wrong while other are right?
The word 'since' normally demands present perfect. This would be fine:

3. I have been working there since I graduated from school.
Would the following be right?

I had been working there since I graduated from school.

Also, would replacing the above past progressive tense with simple past tense make any difference in any way? Or can we use them interchangeably with any difference between the meaning and emphasis?

Thank you.
GargieWould the following be right? I had been working there since I graduated from school.
That would be fine in context, yes.
Gargiewould replacing the above past progressive tense with simple past tense make any difference in any way?
Only in that yet some other action is implied by the use of the progressive from.
GargieOr can we use them interchangeably with any difference between the meaning and emphasis?
Sometimes.
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But MM, I have read in Grammar books that past progressive doesn't work as a complete sentence, but as part of a sentence. So according to this view are the above sentences wrong?

They would be correct in the following way

I was living here for two months before I found out how to turn on the shower.

Please help me.

Thanks.
GargieI have read in Grammar books that past progressive doesn't work as a complete sentence, but as part of a sentence
Past progressive doesn't work as a complete idea, but as part of an idea.