He is my good friend.I'm sitting behind him改为复数形式

This is my friend 改为复数形式 Ruth is my good friend【改为一般疑问句】what's thisin English【改为复数形式】 He is my friend.改为复数句 He is （my friend）画线提问 This is my brother.(改为复数形式） He has a good friend.改为复数形式 My good friend Pat is behind they. he is my good friend的复数句式 That is my sister改为复数形式 This is his cousin改为复数形式 I'm Mike Sm He is a good friend that speaks well of me behind my back. Is this your friend?改为复数形式 1：is that his pen?改复数 2：she is my good friend.改为一 Is he your friend?改为复数