详细归纳有主谓一致所有情况，保证你以后永远也不再怕他
1. in turn一个接一个地
in return 作为回报 I tried to do a good deed, but this is what I got in return,
by turns=one after the other
take turn to do sth.轮流做某事
turn secretary=become a secretary
turn to sb ( for help )
turn up=appear
turn out=prove to be / produce
turn down 拒绝=refuse；音量调低；向下翻；
