when I saw him yesterday,I forgot when meeting him before

The alien___the UFO when I saw him. . I saw him _______ your room when I walked past yesterday a I saw him yesterday afternoon I saw him ____ when I entren the room I saw him when I drove (past in my car). I___(leave) when I saw him come to me. he was play tennis when I saw him 改错 改同义句：when I first saw him when I saw him,he__(play) with other boys. When I went to see him,I saw him the violin. John looked unhappy when i went to see him yesterday Daniel_(hide)behind the tree when I found him yesterday.