Why are you asking like that...? I don't have anybody to miss...And that 'SOMEONE' in this context refers to the person whom you love the most and not able to judge if it is LOVE or LIKE...

here are some common things that every one of us would think and do, when we miss that 'SOMEONE'...

If you don't have a job, get one, and make sure it is a long hard working day! Soon enough you will have so much work on your mind that the missing someone will go away. The main point is to occupy your mind and the best way is to make your thoughts go toward something more useful.

and to express that person that you are missing them???

If you have a picture look at it. If you can't do that. call the person. If you can't do that e-mail. If you can't do that write a letter. I suppose it is also important for that person to know what do you actually feel for them... if not on a regular basis, at least when it is required to be known the most...

if you want to live this emotion and well, then;

Think about and remember all the fun you have had together. Well if you miss somebody have a plan to visit their house someday or you could call the person or email the person or just send a letter to the person that is what you can do if you miss somebody like how i do...