现在分词与动词不定式作原因状语的不同?

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 .
If you still feel confused,leave a message please

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。