Hello Leila, 

This is such a sad story, and I hope that he is alive and being cared for by his family, but... 

In your text, you have put the modal after the verb, but in most cases we use modal (could, should) before the verb. 

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The Likeable Stranger

Almost It was almost three years ago that I saw him, I was coming back from work and he had been sitting beside the street. He sold handmade brushes, washcloths and soap. He was very old and tiny, wearing a circle and stretch hat [what is a circle and stretch hat?]. He always squatted down and stared to at an unknown spot, just occasionally looking at passers by ["passers by" is how we say the people in the street who go past us]. Sometimes he changed his position but I knew that I can could find him around the square.

Today, I suddenly I understood noticed that he wasnt there anymore. I thought wondered when was the last time that I had seen saw him, but I couldn't remember exactly. Maybe two or three months ago. A persistent sob came and my eyes filled with tears. I almost ran to my home before so I wouldn't cry in the street. I started crying when I arrived the home for losing him. I felt I liked him. I wonderd why I didnt speak to him even once? Asking him if he any help he needed any help. I have should have told him that my home was near and if he wanted any help he can could tell me. But it was too late. I wish I was a little kinder to him.