These mice have small teeth.(改成单数形式)

These mice have small teeth.(改成单数形式) teeth these those their的单数形式怎么写? have改成第三人称单数形式 Teeth（单数形式） teeth的单数形式 teeth单数形式 What are those? (改成单数形式) These are my shoes.(改成单数形式) It is a these are my grandfather and grandmother 改成单数形式 快 Whose teachers are these They are ours改成单数形式 Is this a book 改成复数形式 Those are chairs 改成单数形式 What are these These（单数形式） I HAVE TWO GOOD FRIENDS改成单数形式~