だろうと[思「おも」]う => I think probably A N4
Sentence Endings
かと思ったら/かと思うと => just when; no sooner than ~ N2
たろう => probably is ~ N3
Speculation
と思う => I think N5
ようと思う/ようと思っている => thinking of doing; planning to ~ N3
…たら…だろう => If only... N3
Condition (condition contrary to reality)
~ようとは思はなかった => I would not think to~ N1
Beyond expectations
~んがため(に)/~んがための      => in order to ~ N1
たが[最後「さいご」] => Once A occurs, B happens N1
Information, Report
ても~ただろう => Even though...also (already) N3
Innocent
ずくめ => completely; entirely; nothing but ~ N1
~とおもう(~と思う)      => tend to, be about to… N4
Intent