Question

along
I
 /əˈlɑːŋ/  prep  
  1 : in a line matching the length or direction of (something)
   We walked along the beach.
   We walked along (the side of) the road.
   The chairs were lined up along the wall.
   The ship sailed along the coast.
  2 : at a point on (something)
   They have a house along [=alongside] the river.
   We drove to Boston and we stopped along the way for lunch.
————————
II
  adv  
  1 : in a forward direction
   We walked along beside the road.
   I was just walking along, minding my own business.
   The police told the people in the crowd to move along.
   We looked at the houses as we drove along.
  — often used figuratively
   Is there anything we can do to hurry this process along? [=to make this process go faster]
   He was rushing along through the speech.
   Her career was helped along by her wealthy uncle.
  2
  — used to say that someone or something is brought or taken with you when you go somewhere
   He brought his son along [=brought his son with him] when he went to the bank.
   We brought/took an extra battery along just in case we needed it.
  — often + with
   He brought his son along with him.
   The scenery was beautiful. I was glad that we had a camera along with us. [=I was glad that we brought a camera]
  3 : at or to an advanced point
   Plans for a new stadium are already pretty far along.
   The morning was well along when we arrived. [=it was late in the morning when we arrived]
   people who are well/far along in years [=people who are old]
  4 : at a particular place : here or there
   I'll be along [=I'll be there] to see him in a few minutes.
   We missed the first bus, but another one should be along [=should be here] soon.
  5 : from one person to another
   Word was passed along that the attack was coming.
  all along
   : during the entire time since something began
    I knew the truth all along.
    The police knew all along who was guilty.
  along about
    US    informal   : at a time near (a specified time) : about, around
    He arrived in the city along about July 17.
    Our flight should be arriving along about 8:00.
  along with
   : in addition to (something or someone)
    a plane carrying heavy radar equipment along with full fuel tanks
    : together with (something or someone)
    A bill came along with the merchandise.
    All my cousins were there along with my aunts and uncles.
    He worked along with several colleagues to finish on time.