H M If I try to understand the sentence literally, it means "I'm not sure whether we've flown anyone to The Space Station that has not been concerned about their food ", right?? You've substituted "not sure whether" for "don't know if", and I believe that's close enough to be considered the same meaning for our purposes. "Does this sentence mean so?
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
H MIf I try to understand the sentence literally, it means "I'm not sure whether we've flown anyone to The Space Station that has not been concerned about their food ", right??You've substituted "not sure whether" for "don't know if", and I believe that's close enough to be considered the same meaning for our purposes.
H Man interpret