なぜなら => A was done/decided because of B N3
Reason, Result, Response
てとうぜんだ => A is common, natural, not surprising N2
Adjectival, Descriptions
も[同然「どうぜん」]だ => The same as saying A, as good as A N2
Adjectival, Descriptions
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
かい => Really? N4
Sentence Endings
くらいだ/ぐらいだ => Around/about N5
Amount
に[相違「そうい」]ない => No doubt N2
Information, Report
せいで/せいか => Because of A, B N3
Reason, Result, Response