Dear sir or mam,

I am a student of 9th grade. I am not good at english. I am trying to learn this language. Yesterday in my English class, my teacher gave me 3 sentences those were

(1) Ladies and gentlemen presenting you......

(2) A busy and crowded station, full of people trying to go somewhere.

(3) Hogwart station is covered in thick white steam pouring from the Hogwarts express.

and asked a few questions..

Q. for no.1 sentence ---> " without having a subject and an auxiliary verb how can the main verb "present" become a progressive form "presenting" ? Is it a Gerund or Participle or anything else , prove with an example?

Q. for no. 2 & 3 sentence ---> " how can "try" & "pour" become "trying" and "pouring"?

I have studied a few English grammar books and found the answer for sentences 2/3 might be " participle" (not sure) , but i am still finding the answer for Question no. 1.

Please help me....