所有英文句子都必须符合两条定律：“1 + N”与“M-1=引导词”。只要违反这两条定律的都叫“非完整句”。例如
1. He failed to pass the examination. Which disappointed his parents.
2. I think this film is poor. Even though so many people enjoy seeing it.
3. With 2000 junior students and 1000 senior students. Our school had become rather crowded.
4. They got up very early that day ad left at once. Hoping to catch the 7:00 train to Paris.
5. They planned a trip to London. A trip to get many new experiences.
