The four chief aspects of any language are –
AGrammar, Spelling, Vocabulary, and Idioms
BSpelling, Vocabulary, Pronunciation, and Grammar
CGrammar, Syntax, Vocabulary, and Spelling
DGrammar, Spelling, Syntax, Idioms
AGrammar, Spelling, Vocabulary, and Idioms
BSpelling, Vocabulary, Pronunciation, and Grammar
CGrammar, Syntax, Vocabulary, and Spelling
DGrammar, Spelling, Syntax, Idioms