Hi, Laurinete,
First, when you have your own question, you shouldn �t "reply" to another person �s post. Instead, you should go to the bottom of the forum and click on Start New Topic. Then the thread will be your own.
Now for your answers:
The "-ing" form is, in this case, a verbal noun, referring to the process (as a noun)
Speaking is difficult in a foreign language.
Running is good exercise.
The "-ed" form is the past participle, in this case, being used as an adjective.
We have a saying in English, "Don �t cry over spilled milk" ("spilt" in British English).
I have trouble walking because of a pulled muscle in my back.
No one likes to see littered streets in their city.
Bruce