我想参加这个活动。
wǒxiǎng cānjiā zhègè huódòng 。
I want to participate in this event.
她已经参加了比赛。
tā yǐjīng cānjiā le bǐsài 。
She has already joined the competition.
我们应该积极参加社区活动。
wǒmen yīnggāi jījí cānjiā shèqū huódòng 。
We should actively participate in community activities.