1过去式：sang
过去式题目：
1. They tuned up and _sang_ (sing) a song. 他们活动了一下嗓子就唱了一首歌。
2. We _sang_ (sing) together. 我们一起唱歌。
3. If she _sang_ (sing), he would accompany her on the piano. 如果她歌唱的话，他就会为她钢琴伴奏。
4. They _sang_ (sing) birthday songs for me. 他们为我唱了生日歌。
5. I talked to her and _sang_ (sing) to her. I never wanted that night to end. 我跟她说话，我对着她唱歌，希望这个夜晚永远不会结束。
2过去分词：sung
过去分词题目：
1. I had _sung_ (sing) to my dolls and stuffed animals. 我也给我的娃娃和填充玩具唱歌。
2. Over the years, they have been _sung_ (sing) and played in every possible way -- from jazz to country. 随着时间的流逝，这些歌曲仍然被人们以各种方式----从爵士音乐到乡村音乐----演唱和和演奏着。
3. You could have _sung_ (sing) there too if you want it. 如果你想去，你也可以在那里唱。
4. I have _sung_ (sing) the songs of thy day. 我已经唱过了您的白天的歌 .
5. It was the first time I had _sung_ (sing) such a long time. 这是我第一次唱了那麽长的时间啊。
