he could hum songs when he was 4 years old 句型转换he ( )( )( ) hum songs at the age of four.2 don't worry i'll come as soon as i can don't be ( ) ,i'll come as soon as （）
问题描述：
he could hum songs when he was 4 years old 句型转换
he ( )( )( ) hum songs at the age of four.
2 don't worry i'll come as soon as i can
don't be ( ) ,i'll come as soon as （）
答
1 was able to
2 worried ,possible