Hello there! I'm studying "Japanese for Today" and just got stuck on the third lesson. In the grammar section the author gives some pattern sentences like So far so good. Then in the reading section you SUDDENLY can see sentences like 'Kono heya niwa doa ga futatsu arimasu'. Apparently something went wrong with either the explanations or the text. I'd like you to explain to me what's going on here ) Thanks in advance.