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1. Whenever you have words with the word "time" like eating time and lunch time, is it true that you cannot put "the" even if the words are being mentioned subsequently or the usual critera for the article is met?

We are going to have writing time and the?? writing time you are going to have will be spent writing about your leisurely activities.

2. Why does it have the article "a" when it seems to be not necessary?

... have grown into symbols of a coveted commercialism.
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1. No, that's not true. Your example is correct and follows the normal rules.

The writing time you are going to have ...

is fine.

It's just difficult to think of situations when that sort of thing is needed in the course of one's conversation or writing. You have come up with one, though!

2. The idea is that they are symbols of a coveted kind of commercialism, a kind of commercialism that is coveted. Similarly,

They exhibited a ruthless cruelty.
He experienced the pain of an unrequited love
.

CJ

Comments  
Believer1. Whenever you have words with the word "time" like eating time and lunch time, is it true that you cannot put "the" even if the words are being mentioned subsequently or the usual critera for the article is met?

We are going to have writing time and the??(SPECIFIC REFERENCE) writing time you are going to have will be spent writing about your leisurely activities.

2. Why does it have the article "a" when it seems to be not necessary?

... have grown into symbols of a coveted commercialism. (HERE "ONE" MAY BE REPLACED FOR "A" TO GIVE MORE EMPHASIS)

 CalifJim's reply was promoted to an answer.