When I passed the playground,I saw some students _____ football.A play B playing C to play D to playing

when i passed the river为啥用passed. I saw a little boy trying when i passed the park passed能改成passing吗? The dog was chasing the cat when I passed the garden变一般疑问句passed 需要变回原形吗? When I passed the driving test,I thought I was the_____(luck)person in the world. I heard someone open the door when I passed by 改错 When I passed there,I saw some farmers ____(work) in the field 12.When I passed the driving test,I thought I was the________ (luck) person in the world.11.I a the bridge__when i passed it When we passed the classroom,I heard someone______(cry)in it. 12. When I passed the driving test, I thought I was the________ (luck) person in the world. WHEN THE HELL DRIVING TEST PASSED! I heard them giggle when I passed by the girls.请对本句 I heard them giggle 进行语法分析。 I got my best g___ when I left school.--He has passed the exam.--How l____ he is .I got my best g___ when I left school--He has passed the exam.--How l____ he is . 填入适当形式的词语 I found some kids (dance) in the classroom when I passed by. I found a man ____ (lock) the door when I passed by.填入适当形式的词语 When I passed the bus station,I saw him _____ in lineA.waited B.waiting C.wait D.to wait only when I receive the photo did I realize that four years had past中past还是passed I _______ (cut) my hair when the strange man passed the door.用所给动词的适当形式填空.