根据主语来决定,如
My brother can look after himself .
My brothers can look after themselves.
We can look after ourselves.
Can you look after yourself / yourselves 请再用一个词的单复数举几个例子好吗，谢谢谢谢```````~`~~~记住：没有ourself， themself 这两个词His friend can finish it by himself . His friends can finish it by themselves .