They sing a song at the art festival.改为一般过去式.怎么改,求快速回答.是改为一般过去“式”

Tom can sing a song at the party(对sing song提问） 1 is a stove there camping site at the .2 can sing the you song .3 what they have do They is going to sing a song.的错误 Sing A Song 歌词 sing a song sing a song是什么意思 sing a song是什么意思 They always sing a song before class begains.(同义句转换)Their class always( )( )a song. 英语动词形式填空1.A:Look at the children.What _____ they _____(do)?B:They _____(sing) and _____(dance).A:Listen!What song _____ they _____ (sing)?B:They _____(sing)a Russian song.2A:_____ you _____(go) fishing two hours ago?B:No,I ______.A:__ The teacher is good at ___(sing).She ___(sing)a song just now. at t_____,they can sing the song.根据首字母提示填空 求音乐：卡朋特sing sing a song They sing a song at the art festival.改为一般过去式.怎么改,求快速回答.是改为一般过去“式” think sing a song for A Song To Sing 歌词 sing a song的音标, sing along song 还是sing a long song They go to house to house___Christmas song.A.sing B.to sing C.sings D.singing 说明为什么