volitional

〜（よ）うものならN2

if only it were possible to; if you were to — disaster follows

〜（よ）うとおもうN3

think I'll do; be thinking of doing

〜（よ）うとするN3

try to do; be about to do

〜（よ）うとしない

won't do; refuses to even try — blamed on someone's will

〜（よ）うではないかN2

let us; come, let's — a call addressed to a group

〜（よ）うともN3

even if; no matter how — literary, on the 〜おう／〜よう form or the く form

今いまにも〜（よ）うとしているN3

any second now — you can see the change about to happen

〜（よ）うよN5

I'm telling you — news for the listener