“It was cold yesterday.”“ .”Which of the following is wrong.

你想想中文啊!
比如你朋友说：“昨天可真热!”
你回到：“是啊,昨天是真热!”
你表示同意别人的观点,并重复他的话.英语也是一样!
有人说：“it was cold yesterday!”
你同意说：“yes,it was cold yesterday”,简略的说就是“yes,it was so”,然后倒装一下表示强调,"yes,so it was ",yes可有可无,省略它就是“so it was ”了.