It's the same as saying "that's for sure" ?
(I'm not an English native)
yeah, it could work for that phrase. (no worries you're doing fine just keep going :)
그것 = that
이것 = it
이 = this
그 = that (when in close proximity to the speaker, or when reffering to a previous topic/subject)
저 = that (when far away)
이것 = this thing
그것 = that thing (same rules as above)
저것 = that thing (same rules as above)
내가 너에게 보낸 그것을 받았어?
Why.. That thing is certain... why is it marked wrong? :'(
I think your answer is correct (and literal). You would also be correct without "thing" in the sentence, but you're not wrong.
그것 (pronoun) = that
그•것 (determiner+ noun) = that thing
The difference is whether or not there is a space between 그 and 것.