Use before, after, and when to show the order of two actions. Use because to give a reason, as soon as for the moment right after something happens, where for a place, although for a surprise (something happens even though you do not expect it), and until for how long you wait. Put a comma when the time clause comes first: Before I went grocery shopping, I stopped by the dry cleaner's. No comma when it comes last: I stopped by the dry cleaner's before I went grocery shopping.
Examples: Before I left home, I made a list. · I stayed home because I was sick. · Wait here until I come back.
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