Hello! I believe the most appropriate would be to use the infinitives without “to”... It’s necessary to carry out these actions: -Install more containers -Encourage people to recycle Although I still understand perfectly well what you’ve written!

B is correct

"I havent decided yet, why?" Is completely correct. Adding why to the end is the perfect way to express that youre curious as to why they asked that question. You could also say; "i havent decided yet, why, whats up?" Meaning essentialy the same thing. "Why, whats up?" Meaning "why are you asking, what are your plans?"

You could say any of the following: "i didn't realize the phone was ringing" or "i didn't realize the phone had rung" or "I didn't realize the phone rang"

"Nos vamos" means "were leaving", so I say that with the children I watch when its time to leave the house. "Come on, put the dog doen, were leaving!" Or you could say this at the end of a conversation, "We're leaving now, but it was nice talking to you!" I think you may be thinking of "nos vemos", which means "we'll see each other". You can definitley say "Adios, nos vemos!" More or less meaning "bye, see you later!"