this is my a pen 一句中的一处错误在哪

this is a my pen This is my a pen?对还是This is a my pen?对This is my pen？ 为什么说This is my a pen是错的? 为什么不能说 This is my a pen A:that's your pen.___ is my pen B:Do you __ this is interesting? 是This is my blue pen 还是This is my a blue pen有助于回答者给出准确的答案 This is not my pen.M______ is This is a nice pen. This pen is ________and that is ________ pen.A.mine,hers B.my,her C.my,hers D.mine,her this is my pen .改为意思相同的句子 this is a（ ） This litter is ( )my pen friend Tony this is my pen 改为疑问句 this letter is from my pen p___ this is my pen的同义句 this is my pen 改为同义句 this is my pen.改一般疑问句 Is this my pen 同义句是什么 This is my pen f_____Emma.填空 越快越好