1 He bought a new car yesterday.
→it was a new car that HE BOUGHT YESTERDAY.
2 People talked about the fire last night.
→ it was the fire that WAS talked about last night.
(Tại sao đều là câu chẻ mà chỗ tớ in đậm có câu lại có be mà có câu lại ko có be ạ??)