1. Finite Verb
   1. Tense
   2. Voice
   3. Helping Verb
   4. Subject and Verb Agreement
   5. Direct and Indirect Speech
2. Non-Finite Verb
   1. ส่วนขยาย ( V.ing V.3 V.inf to V.inf )
      1. Noun
         1. V.ing
         2. V.3
         3. to V.inf
      2. Verb
         1. V.inf
         2. V.ing
         3. to V.inf
         4. to do & Doing
      3. Adjective
         1. to V.inf
      4. Preposition
         1. V.ing