His pen is in the pencil case 改为否定句

His pen is in the pencil case 改为否定句 there is a pen in his pencil case改为同义句 My pen is in the pencil case改为一般疑问句? This is his pencil case改为一般否定句 This is my eraser 改为否定句 pen,his,Eric's,case,is,pencil,in 连词成句 My pen is in my pencil case.(改为一般疑问句) He didn't__(放)his pen in the pencil case There is a pen in my pencil case.【改为同义句】 he his the pen puts in pencil-case(连词成句) There is a pen in my pencil case改为I () a pen in my pencil ca It`s his pencil case.(改为否定句) This is his pencil.(改为否定句)