Difference between この and こんな


Can someone help me with the difference between この and こんな and when to use
each?

Also I see that こんな is almost always with に particle, why's that?

Does the rules to when to use each of those apply to the difference between その
and そんな as well?




この translates to "this" in English in the sense that you're talking about
このペン/this pen, この犬/this dog, etc.

こんな means "such" or "this kind/type of" or "like this". [Jisho has plenty of
examples for
this](http://jisho.org/search/%E3%81%93%E3%82%93%E3%81%AA%20%23sentences):

> こんな男は信頼できない。
>
> Such a man cannot be relied upon.

こんなに means "so" or "to this degree". [There are plenty of examples for this as
well](http://jisho.org/search/%E3%81%93%E3%82%93%E3%81%AA%E3%81%AB%20%23sentences):

> 彼がこんなに遅いのは変だ。
>
> It is odd that he is so late.




この translates to "this" in English in the sense that you're talking about
このペン/this pen, この犬/this dog, etc.

こんな means "such" or "this kind/type of" or "like this". [Jisho has plenty of
examples for
this](http://jisho.org/search/%E3%81%93%E3%82%93%E3%81%AA%20%23sentences):

> こんな男は信頼できない。
>
> Such a man cannot be relied upon.

こんなに means "so" or "to this degree". [There are plenty of examples for this as
well](http://jisho.org/search/%E3%81%93%E3%82%93%E3%81%AA%E3%81%AB%20%23sentences):

> 彼がこんなに遅いのは変だ。
>
> It is odd that he is so late.

