English Grammar In Use

I downloaded this app to test it for my adult English students before asking them to use it. The first topic I opened (Simple Past, Interrogative negative) had a glaring mistake: "Didn't you like?" That isn't a complete sentence. Native English speakers do not say that. I opened another topic: "Less or fewer?" The content is for the use of "most;" it does not mention "less" or "fewer." The app content is full of errors and is not reliable.

Exilent application I have ever seen or use for learning english Everyone who is interested to learn or improve their english skills must try this application or book, I didn't give much time to that application but I am 100% Sure for best quality or trick that they have is very good, But rate this application option has

Can't find adverb clauses or adverb clause reduction. Otherwise, it looks very good.