should be"was" or "is"? Imagine that you are alone on a tiny island.Choose five inventions you would like to have on the island with you.Tell the group what you chose and why. A:I'd like to have a radio because I could listen to music all day. B:Yes,but that's not going to help you leave the island.I think it would be better to have... ========= my question is: in B,"that's" ,the complete form should be "that is " or"that was"?