grammatical
adjective /ɡrəˈmætɪkl/
  /ɡrəˈmætɪkl/
 - connected with the rules of grammar语法的;文法的 - a grammatical error语法错误 
 
- a grammatical error
- correctly following the rules of grammar符合语法规则的;合乎文法的 - That sentence is not grammatical.那个句子不合语法。 
 Collocations Dictionaryverbs- be
 - perfectly
 
- That sentence is not grammatical.
词源early 16th cent.: from late Latin grammaticalis, via Latin from Greek grammatikos, from gramma, grammatos ‘letter of the alphabet, thing written’.