be working on

〜に取り組んでいる

be working on の類語

in the course of, be in the process of, in the process of, in the middle of, be in the middle of, be engaged in, be tied up with, be halfway through, be up and running, be back online, be off the ground, be in operation, be operational, be functioning, currently ~ing, be busy ~ing, be currently ~ing

be working on の言い換えを探すには

be working on（取り組んでいる）の類語・言い換え（パラフレーズ）を、日本語訳つきで関連度順に並べています。英作文の語彙を増やしたいとき、長文読解で本文と選択肢の言い換えを見抜きたいときに使えます。