Me, Tarzan; Make Copy

At first, one of our team members spoke at a normal speed, using vocabulary and our usual language.

Then, the team member tried, slower, and louder.

Then: subject, verb, object.  "We like soup."

Now it's Tarzan-speak.  "Me, two sisters."  "We California."

Also, Koreans want words to end on a vowel and there's no "f" sound, so

"coffee" becomes "copy"  I was wondering why people were always asking if we needed copies of something . . .
"golf"  becomes "golp-u"
"fork" becomes "pork-u"  -  I'm the only one who needs one; the other team members are quite handy with chopsticks.
"each" becomes "each-ee"

"Sh" and "s" sound interchangeable to me, so
"sit here" sometimes sounds like "sh** here"
"city hall" sometimes sounds like "sh**y hall"

I don't know if the Tarzan-speak helps them understand us, but knowing about the other stuff helps us understand them.