Past progressive (2 cases)
i was driving,my friend was eating wafers.( while+sub+was+verb+ing,sub+was+verb +ing)
2.I was taking rest when
my room mate came.(sub+was+verb+ing+when+sub+verb3form).
in eg 2,whereas can be used in place of when , if the two vers are logically not similar
I was reading the book whereas
Sam was watching cricket.
Where is used to refer place.
The rabbits make their borrows where
they get adequate water.
Hope this works.
(Refer the GMATCLUB ULTIMATE grammar book for more details)
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