[一方「いっぽう」]だ => Change A continues, A does not stop N2
Miscellaneous
と([思「おも」]う、[言「い」]う、[考「かんが」]える) => That A N4
Particles
と[思「おも」]いきや => Even though A (was thought/expected), different result B N1
Contrast/Surprise
[一方「いっぽう」] => On one hand A, on the other, B; Although A, at the same time, B N2
Contrast,Surprise
ようと[思「おも」]う => I think I will A N4
Causative, Passive, Volitional
だろうと[思「おも」]う => I think probably A N4
Sentence Endings
かと[思「おも」]ったら/かと[思「おも」]うと => Athough A, B., As soon as I noticed A, B, almost immediately after A, B N2
Time, Situation
といい~といい => Based on A and B, considering A and B N1
Reason, Result, Response
ずにはいられない/ないではいられない => Can't help but A; A is unavoidable N2
Will, Decision, “Doing”
といえば/というと/といったら => N3
Considering, Concerning
ないものでもない/ないでもない => A is not completely impossible N1
Need/Requirements
[命令「めいれい」] => Do A (command) N4
Can, Should, Must