how (long

properly, interrogative what? (including how? why? when?); but also exclamation, what! (including how!), or indefinitely what (including whatever, and even relatively, that which); often used with prefixes in various adverbial or conjunctive senses

how (long, oft, (-soever)), (no-) thing, what (end, good, purpose, thing), whereby(-fore, -in, -to, -with), (for) why.