I saw them ___football on the playground when I passed by. A

I saw the girls _______ under the tree when I passed by them 同义句转换：When I passed by,I saw them playing football.（改passed when____by,I saw them playing basketball on the playground When I passed by the station,I saw the accident _____.A.happ When I went past the playground ,I saw them____badminton on I heard them giggle when I passed by the girls. When I passed the playground,I saw some students _____ footb I saw a little boy trying when i passed the park passed能改成pa I saw them playing football 【on the playground 】地点状语修饰宾语补足语 I saw them playing football on the playground 这里的地点状语是修饰宾语补足 I saw them playing football on the playground just now 为什么只能 i saw a boy crying when i passed the park（后面一个i能去掉吗?