my brother is too young to go to park alone
alone=on his own=himself多用法，自己选一个
My brother is too young to go to the park alone.
My younger brother is too young to go to the park alone.
my brother is too young to go to park by himself
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024