Her daughter was sick. She had to take a day off to look after her
-> Her daughter was so sick that she had to take a day off to look after her.
--> Dịch: Con gái cô ấy ốm nặng nên cô phải nghỉ một ngày để chăm.
* Cấu trúc so .. that (sử dụng động từ tobe)
S + be + so + adj + that + S + V