why did your sister (cry)用不用加ing

why did your sister (cry)用不用加ing 为什么cry直接加ing,而不用去y cry怎么加ing 为什么cry加ing形式,不用改i为i再加,而是直接加ing? () did your brother cry at school this afternoon?a.why b.wha 英语短语用不用加ing can后面动词用不用加ing? why did your sister get up so early this morning (同义句) 你为什么把你妹妹弄哭了 why did you （）your sister （）? cry加ing为什么不变形 英语固定词组做主语若第一个词是动词用不用加ing?put on your glasses Did you finish doing your homework中do为什么加ing,did后不是加动词原形吗