this lecturer is saying
Hello everyone. Welcome to the second lecture for CS230.
is it grammatical and idiomatic to add a "the" before an "ordinal number"?
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In the sentence
Welcome to the second lecture for CS230.
the definite article "the" is not only permitted but required. Some other uses also use the definite article, such as:
- The Fifth Legion was stationed in what is now Germany.
- The Fourth Horseman of the Apocalypse is Death.
- The second book of the Torah is Exodus.
- The Twentieth volume of O'Brian's series is Blue at the Mizzen.
- The Fourth of July is a holiday in the united States, while the Fifth of November is celebrated in the United Kingdom.
- The third chapter of the novel is the most exciting one.
- I enjoyed the start, but when i reached the fifth chapter, I lost interest.
- In "Sir Patrick Spens" I clean forgot the twenty-seventh verse, so I sang the forty-second twice as loud and in reverse, and no one noticed.
- Hownblower's ship The Sutherland was a third-rate.
However some other uses of ordinals do not take articles.
- Jones has won second place in today's race.
- Second place goes to Jones.
- It is good practice to design a database in fifth normal form.
- Ballet dancers often speak of second and third position.
- I shifted into third gear.
- This restaurant is first-rate.
I can't clearly identify a general rule indicating when n article (definite or indefinite) is required, or customary in such uses.