do 可以用来表示强调,放在动词前,意为“一定,务必”。
Do come here tomorrow. 明天一定要来。
Do be careful. 务必小心。
Do finish the work on time. 务必按时完成工作。
She does like the book. 她确实喜欢这本书。(不可说She does likes the book. )
I did see her walk into the room. 我确实看见她走进了那个房间。(不可说I did saw her walk into the room. )
That is exactly what he does always say. 那正是他常说的话。
I do believe you. 我真的是相信你的。
Do be patient! 千万要耐心啊!