We hold a basketball match once a year/every year.
Once a year,a basketball match i顺便说一下 楼上那位被动句语法错如判行误，后面几个复制的也用错冲姿了，请楼主渣哗注意！
Basketball game is held yarly.
被动句,主要强调篮球比赛每运郑年举行一慎闹次,不强调举办者.
We hold basketball game yearly.
主旁孝颂动句
主动：We hold a basketball game once a year
We hold a basketball game every year
被动：Basketball game is hold once a year
Basketball game is hold every year
被动句,主要强则槐调篮球比赛每年孙轮友举行桐宏一次,不强调举办者.
主动明宴弯空：We hold a basketball game once a year
We hold a basketball game every year
被激闹银动：Basketball game is hold once a year
Basketball game is hold every year
we hold a basketball game every year.