he spent half an hour swim.=It( )( )half an hour( )( ).

he spent half an hour swim.=It( )( )half an hour( )( ). half hour =half an hour it's half an hour We spent half an hour writing it.(%u63D0%u95EE%uFF09 Half an hour =什么? half an hour later half an hour? 是half hour还是half an hour? half an hour or a half hour? a half hour还是half an hour? He spent half an hour in drawing the picture yesterday=() It is about half an hour since he came here.