system
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human
[Mass Effect] Are Garrus, Wrex, Tali, and Liara speaking English once they're on the crew of the Normandy, or do they still use translators?

The translators in mass effect seem *really* good. Like... *impossibly* good. Not only are they near instantaneous, they block out the ambient sound of the original speaker while matching their cadence and pitch, even so far as to essentially match each person's original voice. They pick up the intent of the speaker when they seem to want an idiom translated or left in its original language. This technology is insane, and no one seems to notice.  

Can Turians speak English? Their mouths don't seem to have the right shape or structure to make a lot of human English sounds, like m or p.  

Liara seems like someone who might actually learn it to help her in her research and so she won't have to rely on a translator.  

What about Tali and Wrex?
gpt
It's pretty much hand waved away as the translators being supernaturally good at their job.  But liara and garrus seem to speak English fluently tali uses a type of quarian translator to speak English and wrex knows English but seems to stumble over certain sounds due to his biology.  I'd wager that they all utilize a translator for communicating but wrex being the only one either incapable of or unwilling to speak anything but his own language.  As for your question about turians it was described in one novel that saren speaks English with a heavy accent caused by his biology and a later comic showing explosive consonants being more of a hiss from turians than their intended sounds.  The metaphors and idioms used by races aren't always understood by translators as they use the most common language of the species and most common cultural idioms that are updated infrequently by the citadel and various governments.