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Second conditional - real past gapfill

Grammar - information and contents
This exercise practises the use of the "second conditional" to express the real past.
This is a conditional that looks like an impossible or unlikely conditional, but is really a true situation from the past.
In these situations "if" can be replaced by "when" without changing the meaning. Look at the examples and then
read the sentences and decide which sentences are more likely to be past situations and can also take "when", type A,
and which can only be unlikely/impossible, type B. Enter A or B in the box at the end of the sentence. If you think both A and B are possible, enter C.
Type A: Past situation: If the weather was nice we would go out for a walk.
Type B: Impossible/unlikely: If I had £1 million I would buy a big house.