Particle - つつ - While, -ing, - While or -ing
The particle つつ can be attached to a verb in the present conjugation (-ます). It can be used to say an action is happening at the same time of another action, for example: 私は歩きますつつ歌います (I sing while I'm walking).
It can also be used to say something is currently happening.
Sample sentences
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夜のとばりが下りつつある
Darkness is falling