sing | sang | singing | to sing的区别是什么?

sing | sang | singing | to sing的区别是什么? sing,song和sang的区别 i found her __in her room A.to sing B.sang C.singing D.sing the singing bird与the bird to sing 的区别 sing song和singing的区别 Can you hear Jim a Chinese song?A.singing B.to sing C.sang D This song is heard____now.A singing B to sing C sang D sung SIN和SING的发音区别是什么? michael___ a chinese song 1.sing 2.sang 3.sings 4.singing I hear Miss Silver ___well.(A sings B sang C to sing D sing) sing的过去式是什么? sing的过去式 是什么