When the boy couldn't find his mother,he didn't knowA．what to do B．how to do C．what to do it D．how to do it 要有解析

the little boy couldn't ride a bike when he was five同义句 I couldn't help when the boy made faces to us when the boy was when ()the boy()his homework 初中英语 the boy couldn`t help crying when he saw his favourite fish was ____.AlivingB alive CdiedDdead请翻译句子并加以说明原因谢谢 when the little boy saw her morther___,she couldn't help___A.coming;laughing B.come;to laugh C.comes; laughs D.came; laughing seeing this,the little boy couldn't help____（笑）. the boy was lost 同义句 the boy couldn't ___his___back home. So frightened ( )that he couldn't say a wordA.the boy was B.was the boy C.did the boy be D.be the boy The boy couldn't find the key _______ the doorfor to with of理由 The boy couldn't find his mother it made him (cry)要说明理由The boy couldn't find his mother it made him_____ (cry) When the boy couldn't find his mother,he didn't knowA．what to do B．how to do C．what to do it D．how to do it 要有解析 The boy ran so fast that I couldn't catch him.变为too...to.句型 the boy said he couldn't finish his homework改为直接间接引语 we looked for the m( )boy ,but we couldn't find him the boy said he couldn't finish his homework改为直接间接引语 the boy was so weak that he couldn't walk on “The boy was so weak that he couldn't walk on(变为简单句）