有这种情况
She had no time left in which to pack her things
他没有时间收拾行李了
先行词是time,关系代词是which
which代表time,但实际上后面不是定语从句
而是不定式
to pack her things in the time
in which to pack her things全部看成是修饰time的就可以了
After the harvest,the peasants selected their best produce with which
to pay their tax to the state.
收了庄稼,农民选最好的粮食来交税
which代表produce,农作物
to pay their tax to the state with produce
用农作物来当作税交国家
with which to pay their tax to the state.
整个就看成是定语来修饰produce
虽然是不定式
