现在分词与动词不定式作原因状语的不同？

Question

比如说，i am very pleased to have made friends with you.里为什么不用having made friends with you呢？

Answer 1

比如说，I am very pleased to have made friends with you.里为什么不用having made friends with you呢？

Answer:
一般不定式作"原因/结果"状语只放在句尾,而现在分词作状语除表"伴随"外一般要用在句首.原句可写成如下形式:
"Having made friends with you ,I am very pleased .

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Answer 2

一般没有多大的区别， 只是凭语感好了

细微的就是to do 有点将来的意思，也就是即将

而doing 有点 既然，因为的含义。