ๆฌ้กต้ข็ฎๅไป ๆไพ่ฑๆ็ๆฌใ
Practise forming positive sentences in the past perfect continuous.
Practise forming negative sentences in the past perfect continuous.
Practise making yes/no questions in the past perfect continuous.
Practise all forms of the past perfect continuous including positive, negative, and yes/no questions.
