I don't understand why some of these phrases have "de" or "que" in parentheses - what does this mean?
antes (de) que (before), con tal (de) que (provided that), mientras (que)
Are there certain times when you would use the words in parentheses or not use them? I'm confused as to why this isn't explained.
The words in brackets mean that you can use them or you can omit them. It would be equally correct either way.
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