Question

新概念英语问题

新概念英语问题one would expect them to know their parts by heart and never have cause to falter.Yet this is not always the case.这句话里面的无法和固定搭配讲一下

Answer 1

首先是虚拟语气（would）；其次这个是并列句。句中的词组expect sb to do sth（期望某人做某事），know ... by heart （知道，记住）。
然后not always the case是固定表达，意思是“不总是这样“。

追问

这里的one怎么回事

追答

One 泛指人们 可以是任何有关的人

Answer 2

expect sb to do sth

have cause to

追问

什么意思呀