[必要「ひつよう」]はない => It is not necessary for A to be done N2
Needs, Requirements
にひきかえ => In contrast to A N1
Comparison/ Exchange
を[余儀「よぎ」]なくされる => Must do A N1
Will, Decision, Doing
[際「さい」]して/に([際「さい」]し)/に[際「さい」]しての => At the time of A (which starts now).. N2
Time, Situation
なさい => Do A (command) N4
Can, Should, Must
さえ/にさえ/でさえ => Even N3
Not only, Not even
~てください => Please do ~ N5
Asking and Telling
~ないでください => Please don't do~ N5
Asking and Telling
をください => Please give me N N5
Asking and Telling
させて[頂「いただ」]きます/させてもらいます => Allow me to A N1
Miscellaneous
というより => Rather than A N3
Comparison, Exchange
さて => So N2
Miscellaneous