改错句,Mary and Tom are all here.请问哪里错?

改错句,Mary and Tom are all here.请问哪里错? Helen and her sister are in Tom'party.这句英语哪里错了,请改错. Are everyone here now?---no,Jim and Tom aren’t here哪里错了? Tom and Peter are all in the classroom .(改错) Both Mary and Tom are students.（改为同义句） Mary.and.Tom.are in. tom and jerry are from the American哪里错了!（改错题） 改错题：Here are my friends Jack and Tom.We are both in the same Tom and mary is singing哪里错了 Tom and Mary are husband and wife Mary and Tom are in (同一个班) AND,THESE,ARE,TWO,FRIEND,MARY,TOM,HER 如何连词成句?