QUESTION: Fix punctuation: I have smoked fillet mignon with mushroom sauce and a mixture of boiled grains of some sort
ANS: I have smoked fillet mignon with mushroom sauce and a mixture of boiled grains of some sort.

QUESTION: Fix punctuation: This number however declines gradually during the decadelong latency period associated with AIDS Typically after CD4 cell count drops below 200 infections characteristic of AIDS set in However losing a T cell is not like losing an arm or a leg
ANS: This number however, declines gradually during the decade-long latency period associated with AIDS. Typically, after CD4 cell count drops below 200, infections characteristic of AIDS set in. However, "losing a T cell is not like losing an arm or a leg" .

QUESTION: Fix punctuation: Companys name Don Gnu is built around the paradox to be one and several at the same time
ANS: Company's name, Don Gnu, is built around the paradox; to be one and several at the same time.

QUESTION: Fix punctuation: When youre going through a hard time people dont always know what to say
ANS:
When you're going through a hard time, people don't always know what to say.