过去分词表被动,然后理清主动还是被动,主动用ing,被动用过去完成时
如:jion is playing football with his homework down.
[ 作业被做完]
join is playing football with his sweat running.
{流汗是主动}
过去分词表被动,然后理清主动还是被动,主动用ing,被动用过去完成时
如:jion is playing football with his homework down.
[ 作业被做完]
join is playing football with his sweat running.
{流汗是主动}