monokakido.jp/ja/dictionaries/jgdb/
A Japanese grammar dictionary covering about 200 beginner-level grammar points with detailed English explanations, example sentences, and romaji. Available through the Monokakido dictionary app for iOS.
GrammarDictionaries and lookupApps and toolsIn JapaneseJLPT N5JLPT N4Example sentencesDictionariesBeginner