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"Before I went to the shops" would make sense as an answer to a question. eg. "When did you do your chores, son?"
So, as I did say (and as you confirmed), on it's own it makes no sense. It...

Just adding to DDT's point. When you use 'ago', you can imagine a pause in the sentence. Whereas 'before' keeps the sentence flowing.

An exception to look out for- when 'before' is the first word...

By putting an 's' on the end, you simply turn it into a noun. And 'left over' (two seperate words) isn't a noun. If you say 'leftover' as one word, it is an adjective (?term). I mean that 'leftover'...

You're spot on.

DDT, your "we were on time for the bus" example is used colloquially, definitely. But I think if you have "for..." afterward, continuing the sentence on, you'd use in time.
So,...