hear the news,I was heart broken.为什么要变为Hearing?

hear the news,I was heart broken.为什么要变为Hearing? hearing the news we felt very surprised这里为什么用hearing而不用hear? hearing the news,i was____surprised,for i was astonished On hearing the good news,the mother's heart was ____ pleasur 改错[为什么] I'm sorry hearing the bad news. I was disappointed to hear the news中的to hear the news在句中做什么成 Hearing the news,I was _____ surprised,for I was astonished. I was _______（shock） to hear of the news Hearing the news,I was _______excited________ say a word.A.e Hearing the news,I was _______excited.A.enough,to B.too,to C 这句话有语法错误吗：I was so disappointed when hearing the bad news.是否 By hearing the news,I was very much pleased.(改错）