英语翻译I saw ____ _____twenty students playing soccer on the pl

英语翻译I saw ____ _____twenty students playing soccer on the pl When I saw Mary,she ______ on the piano.选项:a、is playing b、pl he saw some boys （）football on the playground.A、playing B、pl How ____(喧闹)the students are playing on the playground! when____by,I saw them playing basketball on the playground I saw him playing football on the ground just now There are always students playing soccer on the grass.这里为何用p I saw the students ------- (play) volleyball on the playgrou She saw some boys ____ soccer on the playground when she was I saw the students who were playing football yesterday 这个是定语 Not all the students like playing soccer.改为同义句. The teacher saw the students ____(play) on the playground at