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thirteen years old thirteen-years-old thirteen-year-old thirteen-year-old
hear heard have heard had heard
for twelve years ago since she was four twelve years ago at the age of four
a, the an, the an, 不填 a, 不填
a 18-year-old an 18-years-old an 18 years old an 18-year-old
joined joined in has joined has joined in
joined in took part in took part joined
hear heard have heard had heard
find out pick out look out speak out
15 years ago 15 years before since 15 years ago in 15 years
had taught had been teaching used to teach was teaching
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