1,I saw some trees whose leaves were black with diease.能变成I

1.变后的句子语法虽然没有错误,但是意思侧重点不一：
1）I saw some trees whose leaves were black with diease.
我看到了一些叶子因为疾病而变黑的树.
即saw的宾语是some trees,而whose leaves were black with diease为定语从句修饰trees.
2）I saw leaves of some trees were black with disease.
= I saw (that) leaves of some trees were black with disease.
我看到一些树的叶子因为疾病而变黑了.
从句leaves of some trees were black with disease做主句谓语saw的宾语.
2.in place of可以算作是固定的介宾短语,在句子除了做状语外,还可以做表语/后置定语/补足语.
如：He was in place of me in the company.
而和regardless of一般只做句子的状语.