1.I don't know how much the coat costs .=I don't know the price of the coat.
2.Can you tell me when to visit New York?what are they looking for(Do you know)Are they having an English lesson，She said改为含宾语从句的复合句1.Do you know what they are looking for?2.She asked if they were having an English lesson.好纠结呀呵呵，没什么，你自己决定好了。