“The X you asked me to Y” (cantonese)
“The (n) you asked me to (v)” 


  
  你叫我(v)嗰個(n)
  


Example:

“The (bag) you asked me to (buy)” = "你叫我(買)嗰個(袋)"

“The (person) you asked me to (kill)” = "你叫我(殺)嗰個(人)"


  
  嗰個你叫我(v)嘅(n)
  


Example:

“The (bag) you asked me to (buy)” = "嗰個你叫我(買)嘅(袋)"

“The (person) you asked me to (kill)” = "嗰個你叫我(殺)嘅(人)"


  個 is the classifier for the noun, replace 個 with other classifier when necessary


For example:

你叫我做嗰(件)(事)

嗰(件)你叫我做嘅(事)

The classifier for  '事' is '件', not '個'


  In many cases, you cannot transfer English grammar directly into Chinese  sentence, this is one of them "嗰個袋(that bag) 你叫我買 (you asked me to buy)" is not grammatical in Chinese