You should be focused on study.
be focused on... 是一个固定用语，如果非要说为什么要加 ed 的话可以理解为接在 be 后面的动词要用过去式（+ed）或者用进行时（+ing）.
用英语翻译：你们要集中精力学习。句中用到（be focused on）。另外为什么focused,要加ed？
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