I join them in the party. 我加入他们的聚会。They joined the this company in 2011. 他们在2011年进入公司（工作）。We all joined in the dancing. 我们都在一起跳舞。格式是 join sb. in + 活动
用join in造句，短一点的，要注明意思谢谢
I join them in the party. 我加入他们的聚会。
They joined the this company in 2011. 他们在2011年进入公司（工作）。
We all joined in the dancing. 我们都在一起跳舞。
格式是 join sb. in + 活动2012-07-28
Come and join in the merrymaking.来参加我们的狂欢2012-07-28
They are going to join in the singing.
他们将参加唱歌。2012-07-28
They are going to join in the singing2012-07-28
