[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
つつ/つつも => While A, B. Although A (is beng done), B N2
Information, Report
でなくてなんだろう => It's definitely A (and not something else) N1
Information, Report
つ~つ => Doing A and B (repeatedly, one after another) N1
Information, Report
ところを/ところに/ところへ => At time/situation A N2
Information, Report
~ましょう。 => Let's (together), Shall I/we…? N5
Verb suffixes
でしょう => I think... Probably.., I wonder if... N5
Miscellaneous
つつある => In the middle of A; in the process of A N2
Time, Situation
ところ => Have done N4
Situations and Experiences
だろう => Probably A N4
Sentence Endings
しまつだ => Denotes negative results A N1
Reason, Result, Response