Very often conditional clauses speculate about events in the future. Such clauses can be open or closed. In an open conditional the speaker expresses no opinion about whether the future event is likely to happen or not:
If they succeed in that, Germany’s economy and its workers will be better off.
(The writer has no opinion of whether they will succeed or not.)
In a closed condition the writer makes it clear that the future event is more or less unlikely:
If they were successful at this stage, they would then have to find the fee.
(But they are not likely to be successful.)
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