老师好！ 新概念三，第22课里有一句话：
One would expect them to know their parts by heart and never have cause
to falter.
人们期盼他们熟记台词，永不结巴。
我的理解是：
主语 one，谓语 would expect, 宾语them, 宾语补足语 to know their
parts by heart.
关于句子后半段 and never have cause to
falter 有点搞不清楚怎么分析了，是不是应该理解成 and (would expect them to )never have cause to
falter? 括号里的内容是被省略了吗？但是这种理解又有点奇怪，请老师指教！
