You should always wash your hands before meals. "(B)efore meals" is an adverb phrase, but before is not an adverb because it has an object to complete its meaning . ----------------------------- Before leav ing he said good-bye to me.
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InchoateknowledgePlease come before the meeting starts.
Before the meating comes, please come.
The meeting comes
please come
they are two clauses
please come is more important than when you should come.
Therefore, please come is the main clause.
The other plays a subord