新定义三，第22课里有一句话：One would expect them to know their parts by heart and never have causeto falter.  大家

老师好！  新定义三，第22课里有一句话：

One would expect them to know their parts by heart and never have causeto falter. 

大家期盼他们熟记台词，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 theirparts by heart.

关于句子后半段 and never have cause tofalter 有点搞不了解如何剖析了，是否应该理解成 and  never have cause tofalter? 括号里的内容是被省略了吗？但这种理解又有点奇怪，请老师指教！

我感觉网友的理解是正确的。