Always. Subs 4 lyfe!
Now, English isn't my native language(I'm Swedish), and my English has rusted quite a bit since I don't actively talk with native speakers anymore(aka, I stopped playing WoW), so that might be part of it, but mostly it's because I can have a hard time following what they're saying. If I look away for just a moment of get distracted by something then I can miss an entire line of dialogue, but it practically never happens if subtitles are on.
I don't know, some people think subs are distracting, but for me they make it easier to focus honestly.
EDIT: And sometimes I watch Swedish films with subs, but sometimes they don't actually match with what they're saying, so.
Now, English isn't my native language(I'm Swedish), and my English has rusted quite a bit since I don't actively talk with native speakers anymore(aka, I stopped playing WoW), so that might be part of it, but mostly it's because I can have a hard time following what they're saying. If I look away for just a moment of get distracted by something then I can miss an entire line of dialogue, but it practically never happens if subtitles are on.
I don't know, some people think subs are distracting, but for me they make it easier to focus honestly.
EDIT: And sometimes I watch Swedish films with subs, but sometimes they don't actually match with what they're saying, so.