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Hello ifencing,
I'm afraid I can't explain why books are written as they are - for this you will have to contact the author of each book. What I can do is explain how articles are used with general meaning. It is possible to use the indefinite article, the definite article and the zero article with general meaning, but there are differences.
a + singular countable noun
we can use this with general meaning when we are talking about something which defines the group. For example:
In other words, being an impressive sight is one of the characteristics of an elephant; if we saw an animal and it was not impressive then we could be fairly sure that it was not an elephant. We are talking about any elephant here - it is true of them all.
the + singular noun
we can use this with general meaning when we are talking about our image or concept of the noun. For example:
Here we are not talking about a real elephant, but rather the concept of 'elephant' in our heads.
no article + plural countable noun or uncountable noun
we use this to talk about what is normal or typical of a type. It may or may not be true of all individuals but it is typical of most. For example:
Here we are talking about the average height of Swedes, not any particular person or concept.
The distinction is subtle, as I said, but sometimes it can be important. For example, we can say with general meaning:
However, we cannot say:
This is because being in danger of becoming extinct may be true but it does not define the whale.
I hope that helps to clarify it for you. It is a difficult area and the distinctions are quite subtle.
Peter
The LearnEnglish Team
Hi wangyao,
You are right -- 'a' has two pronunciations, a strong one (/eɪ/) and a weak one (/ə/). I'm not sure what dictionary you used, but I'd recommend the Cambridge Dictionary as a good general reference.
All the best,
Kirk
The LearnEnglish Team
Hello Donald Harrison,
'Society' has no article when it refers to the abstract concept of society, with a meaning similar to culture. We use an article with it when we are referring not to the abstract concept but to a particular organisation: I'm a member of a music society, I keep my money in the local builing society.
In your second example the word 'Irish' is used in different ways:
'World War Two' is treated as a proper name. Where a descriptive name is used there is an article, so we say World War Two (no article) but the Second World War, the Vietnam War and the Battle of Trafalgar.
Peter
The LearnEnglish Team
Hello Zeeshan Siddiqii,
There are several options here. You can say 'the city of London' or just 'London'. Sometimes you will see the informal phrase 'London Town' used. You can also see the capitalised phrase 'the City of London' or just 'the City', which refers to the financial centre.
Best wishes,
Peter
The LearnEnglish Team