英语强调谓语动词用do /does/did do，，必须满足两个条件

1.肯定句

2.谓语动词是实义动词的一般现在时或者一般过去时

①do /does/did do,表示“的确，确实”

Believe it or not ,he did win the first prize .

He did pass the exam .

She does hope you will get better soon .

I do hope you will stay for lunch .

He did come but soon went back .

She thinks I do not love her but I do

I did love you ,but now it is time to say goodbye.

②do 动词原形,表示“务必，一定”

Do remember to close the door .

Do stay in bed for a couple of days.

Do be careful .

Do come to the party tonight .