老师,帮忙一个句子,thx
问题描述：
老师,帮忙一个句子,thx
As external conditions change,it becomes tougher to meet the three conditions that sociologists since the 1950s have considered crucial to making close friends.请问这里to后面为什么是make的ing形式呢?
答
crucial to something是固定的搭配
对什么什么至关重要的意思,这里something是名词,你要用动词就得变动名词.making close friends相当是一作为名词的动词-ing词组.
有点像look forward to something,期待什么事.look forward to 后面要加动词也要变成动词ing, 动名词形式.
所以：关键是要看这个to在这里 是跟的是前面是一个词组呢,还是跟后面是to do的不定式.