🅰️’S🅱️

#grammar structure #apostrophe s #genitive case #x's y #possession structure

🔧🗣️✍️

#language mechanics #grammar structure #fixing grammar #linguistic structure #sentence mechanics #usage guide

🕰️➕🕰️✅

#deep past #past of past #grammar structure #pluperfect #verb tense #completed action #past perfect

🗣️➡️🌳

#sentence diagram #syntax tree #grammar structure #phrase structure grammar

➕🌳🗣️

#Extended BNF #syntax tree #formal language theory #grammar structure #language definition extension #computer science notation