"I can't believe that I just saw you and talked with you on Monday. You told me that you will bring me sweet potatoes, that is good for losing weight, because I am on a diet. You are so thoughtful. Although you are older than me, you don't treat me as a little boy. You said a bunch of funny things that you got (not sure what this means) when you were young. You also brought me presents during festivals (or holidays). What a wondeful man. You passed away in your sleep. Hope you have a better life in another world."

(a) see footnote
punctuation
spelling correction
added or suggested word
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A Good Friend Died (a)

Although you were (e) older than me, you didn't (e) treat me as a little boy. You said a bunch of funny things that you got when you were young. (Did he tell you funny jokes and stories from his youth?) Also, you gave me presents on (f) special holidays. What a wonderful man you were. (g) You passed away in your sleep. I hope you can have a better life in another world. (g)

a. Capitalize the first letter of each word in a title.
b. Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet.
c. We use would as the past tense of will: to talk about what people wanted to do or were willing to do.
d. subject/verb agreement in number: plural
e. Verb should be past tense.
f. On is a preposition used to specify days or dates.
g. Sentence fragment, missing subject or verb.