单三形式就是谓语动词要用动词的第三人称单数
比如:
1He has a big nose
2She does her homework every day
这里的has, does就是为主动词的单三形式再写三个句子带上译丈My sister has breakfast every day
我妹妹每天早晨都吃早餐Peter plays basketball twice a week
皮特一个礼拜打两次篮球My father works in a factory
我爸爸在工厂上班