we have a party this afternoon.please come and join us.为什么jo

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we have a party this afternoon.please come and join us.为什么join不用join in?它们的区别是什么?
什么情况下用join?什么情况下用join in?

因为后面有us,所以用join.【 join sb in+活动】
join+组织,join in+活动
join the army （组织）
join us
We all joined in the singing.我们大家一起唱歌.（活动）
【俊狼猎英】
再问：你那个【 join sb in+活动】是什么意思？为什么有些是 join sb in+活动，有些join in直接连起来，比如你这里的We all joined in the singing. “join in”
再答：如果有人的话，就放在in的前面，in后面+活动 join sb in 【加入某人做什么活动】
再问：一个派对不也是活动吗？照你说不是要用join in？
再答：派对是组织，有时是活动

I ______(have) a party next week.can you come and join us? please come and join in us. --will you please join us to play basketball this afternoon、 Come and join us We want to play soccer this afternoon.Please j( ) us Please donot come at four o`clock this afternoon,I ( have) a Come and join us,Jimmy! come and join us是什么意思改错 we have a science this afternoon. would you please-----us in playing football this afternoon A we have a new family joining us today,这里的join为什么要加ing? Tom,come and join the party.改错