| by what means(expression, adverb, way, manner, how) |
| by what method(expression, adverb, way, manner, how) |
| by whose help(expression, adverb, way, manner, how) |
| casually(adverb, chance, manner, incidentally) |
| cause(noun, reason, motive, why) |
| fortuitously(adverb, chance, manner, incidentally) |
| from what source(expression, adverb, way, manner, how) |
| motive(noun, cause, reason, why) |
| mystery(noun, cause, reason, motive, why) |
| obiter(adverb, chance, manner, incidentally) |
| parenthetically(adverb, chance, manner, incidentally) |
| proof(noun, cause, reason, motive, why) |
| remotely(adverb, chance, manner, incidentally) |
| subordinately(adverb, chance, manner, incidentally) |
| through what agency(expression, adverb, way, manner, how) |
| through what medium(expression, adverb, way, manner, how) |
| unexpectedly(adverb, chance, manner, incidentally) |
| what degree(expression, adverb, way, manner, how) |