一体 => …the heck; …in the world; …on earth N3
一緒に => together N5
一口に…といっても => Although in general... N2
Evaluate
一度に => all at once N3
一通り => Basically, (get) over, done N2
Base, base
一方だ => more and more; continue to ~ N2
~と(も)なると/と(も)なれば => ~Just, whenever, once N1
Condition (hypothetical condition)
ともなると => When/once something happens N1
Reach level
...かとなると => When it comes to... N3
Story topic
一応 => more or less; pretty much; roughly; tentatively ~ N2
となる => become, to turn into N4
Result status
いかなる…とも => whatsoever; whatever N3
Extreme example