would **((弱)) wd, d, d；((強)) wd〔初12c以前；古英語 wolde. will^１ の過去形〕 →【助】 →成句

would-a wd, wd((視覚方言))＝would have.

would−be *wdb〔初17c；「would (仮定法過去形)+be＝…であることを望むであろう」の形容詞化〕

would-n't **wdntwould not の縮約形.

would・n'ta wdnt((視覚方言))＝would not have.

wouldst ((弱)) wdst, dst, dst, wtst；((強)) wdst, wtst

would've wdvwould have の縮約形.