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
かと思ったら/かと思うと => just when; no sooner than ~ N2
~のを => Nominalize verbs N5
Nominalization
~とおもう(~と思う)      => tend to, be about to… N4
Intent
だろうと[思「おも」]う => I think probably A N4
Sentence Endings
ようと[思「おも」]う => I think I will A N4
Causative, Passive, Volitional
てっきり...と思う => surely; certainly; without a doubt N3
... を ... という => called; named; that ~ N4
Speaking
~ようとは思はなかった => I would not think to~ N1
Beyond expectations
と([思「おも」]う、[言「い」]う、[考「かんが」]える) => That A N4
Particles
じつをいうと => Frankly speaking N2
Story topic