1. Why would you do that?
  2. Why will you do that?

What are the difference between 1 and 2? I watched a movie and an enemy offered to help the male lead, and the male lead said “why would you do that?”.

I was wondering why he used “would” instead of “will”. I know the difference between “would” and “did”, but does the difference also apply to “would” and “will”?

1 Answer 1


Both questions ask for an explanation of an action. "Why would you do that?" implies that the action is a possibility, but it may not happen. "Why will you do that?" implies that the action is definitely going to happen. In this case, would is a better word choice since the help being given is only a hypothetical, it might or might not happen.


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