the fire was so big that firefighters found it hard to get
it是形式宾语,真正宾语是to get ...
it宾语, hard宾补,to get...是真正宾语.
that是不能充当形式宾语的.
如果改为宾语从句
则应为
the fire was so big that firefighters found that it was hard to get...
it是形式主语;而to get...是真正主语
the fire was so big that firefighters found it hard to get
it是形式宾语,真正宾语是to get ...
it宾语, hard宾补,to get...是真正宾语.
that是不能充当形式宾语的.
如果改为宾语从句
则应为
the fire was so big that firefighters found that it was hard to get...
it是形式主语;而to get...是真正主语