と([思「おも」]う、[言「い」]う、[考「かんが」]える) => That A N4
Particles
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”
ていられない => Cannot continue to A N2
Needs, Requirements
なければならない => Must do A; have to A N4
Can, Should, Must
てばかりはいられない => Cannot always A N2
Needs, Requirements
といえば/というと/といったら => N3
Considering, Concerning
それなら => If A is the case, then (let's) B N2
Reason, Result, Response
[切「き」]れない => Can't finish/complete A N3
Potential, Possibility
ねばならない => Must A N2
Needs, Requirements
にたえる/にたえない => Can't do A, can't stand/tolerate A, Can do A, N1
Potential, Possibility
にほかならない => Only A N2
Reason, Result, Response
てならない => Very A; Extremely A N2
Degree, Level, Amount