Are there sentences where 跟 and 和 are interchangeable? For example:


我跟朋友去公园了。
我和朋友去公园了。


Are both of these sentences correct? Are there any subtle differences in the meaning conveyed?

If they are not entirely interchangeable, how do we know which one to use?
Both of them are correct, and the 跟 &amp; 和 here are the conjunction. The one 我同朋友去公园了 is also correct.

They are almost the same, but if you do want to distinguish the meanings (except for the spoken/written difference):


我跟朋友去公园了。: it seems like my friend (朋友) wanted to go to the park (公园), and s/he asked me whether I wanted to go with her/him. So I just went with her/him and left a message to my mother: "Mam, 我跟朋友去公园了".
我和朋友去公园了。: it seems like my friend and I were doing something together (e.g. having lunch), after it, we decided go to the park together.


Maybe that's not a very good example. But I cannot think of a better one because both of them are almost the same (99.9%). :p