Problem 1
Duolingo is for solo learners, but it has very limited spoken exercises because it focuses on more listening and writing practices. If you take a look at the screenshot on your right hand, it’s says “type what you hear.” this is Duolingo’s exercise and you cannot find speaking practice for verbal communication. Due to this limitation, Duolingo does not provide you with practice common phrases like “I would like order a cup of coffee” and “Where is the train station?”.
Also, Duolingo has limited interaction for practicing a new language as it does not have an AI chatbots that can have human like conversation and interacts with you through your voice or texts.