GIẢI THÍCH GIÚP MÌNH TẠI SAO LẠI ĐIỀN ĐÁP ÁN NHƯ VẬY ĐƯỢC KHÔNG Ạ 1.He was so brave that he could tell her what he thought about her. (IT) It was brave of him to tell her what he thought about her. 2.There has been a slight drop in the number of people using public transport. (SLIGHTLY)  The number of people using public transport has dropped slightly. 3.There was an increased demand for travel, so the government decided to invest in building the very first metro system. (AS) As there was an increased demand for travel,the government decided to invest in building the very first metro systems. 4.They took the president to the hospital for an emergency operation. (WAS) The president was taken to the hospital for an emergency operation

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