1.13.4.4.Perfect continuous infinitive (Perfect continuous infinitive)
Ví dụ
- He seems to have been working all night. (Có vẻ anh ấy đã làm việc suốt đêm.)
- The machine appears to have been running continuously. (Có vẻ chiếc máy đã chạy liên tục.)
Ví dụ