when jackie was 17,he began to do dangerous

1 when he was ______,he began to learn computer. He was halfway home when it began to rain. When Kari was over fifty,he began to learn Russian. he began to go to school when he was 7 year old（同义句）he began He began to learn English when he was four years old(同义句) He He began to play the piano when he was seven.(同义句)He( )( )th 同义句转换.1 When he was seven years old,he began to go to school 用old,my,was,to,father,he,years,began,when,when,work,twenty连词 he began to be interested in music when he was 9 years old 同 改为同义句：He began to learn english when he was six years old. He began to learn the piano when he was?(改为同义句) 翻译一下He began to build a business when he was only 18 years o