it is my friend ,Tom .为什么不能用he is my friend ,tom?

it is my friend ,Tom .为什么不能用he is my friend ,tom? Tom is my friend. This is my friend.______name is Tom._____is English.(he) he is my friend tom friend和tom之间有没有逗号 He is my good friend Tom的问语是什么 Tom,t____ is my friend,David Tom is my friend.He is the best friend of me.哪里错了 Tom is my friend.His pencils is blue和Tom is my friend.His pe tom is my friend 对tom的提问 英语翻译my best friend is tom,he is from the united states.he is he is my ( )friend The boy is Tom.() is my good friend