用定语从句将两个句子合并成一个句子。

Question

(1)There was a time. We had to take a boat to go Tokyo at that time.
(2)The reason is not true. He gave the reason to the teacher.

Answer 1

There was a time at which we had to take a boat to go Tokyo.

上面的 at which 可以用一个词 when 给替换。

The reason he gave to the teacher is not true.
He gave the reason which is not true to the teacher.

怎么合并都行，取决于句子主要表达的是什么内容。
通常上面那一种比较常见。

Answer 2

There was a time that we had to take a boat to go Tokyo 。
The reason he gave to the teacher is not true.

Answer 3

(1) There was a time when we had to take a boat to go Tokyo.
There was a time at which we had to take a boat to go Tokyo.
当time是先行词，表示“次数”时，可以用关系代词that 引导定语从句，that 可以省略。
例：This is the second time (that ）the president has visited the country .这是总统第二次访问这个国家。
表示“一段时间”时，应用关系副词when 或at /during which 引导定语从句。
这道题因为后面是at the time 所以前面是at which 但是先行词在前面两句话重复的部分所以后面的要省略。介词+which 这时候可以等于 when

(2) The reason which/that he gave to the teacher is not true .
The reason 是先行词，后面可以用why 引导原因状语从句。关键句型是The reason why …… is/was that ……后面that 引导的是表语从句。
而这里gave 后面是双宾语 give sb sth =give sth to sb 前面先行词做后面gave 的宾语。这时候关系词可以用which /that ,也可以不填。