在含有since的时间状语从句中的主要分句能用一般过去时和用完成时有什么含义的不同?The annual assembly was held
outside the Chinese mainland for the first time since its establishment in 2018.与主句改成现在完成时有什么具体语义上的不同?
(1) Look at those young guys over in the corner playing their air guitars. Don't they look geeky? 看看在角落假装弹吉它的那帮年轻人,看起来就招人讨厌。(2) Over in the corner three birds...