Several audiences left before the film finished.
Audience is indeed countable but it is a ‘collective’ noun, and so an (=1) audience can comprise many people. If you want to focus on a subgroup of an audience then it is common to refer to these people as ‘members of an audience’: Continue reading
I am a staff at the Ministry of Religious Affairs.
Although you will occasionally find an example of staff as a countable noun, it is extremely rare.
Used as an uncountable noun, staff refers to people who work for a particular organisation: Continue reading
Moreover, a failure can be caused by a lack of practical experiences.
It’s annoying, I know, but while some nouns are countable and others are uncountable, yet others can be either countable or uncountable, and here are two examples in the same sentence: failure and experience. Continue reading
Children these days spend a lot of time using interactive media which increases their exposure to aggressive contents.
It’s difficult to imagine contents behaving aggressively: Continue reading
The government need to make more of an effort to fight crimes.
Crime can be countable or uncountable, and as with other nouns that behave like this, the uncountable form has a more general meaning and the countable more specific.
Another way to look at this is to notice that fight and crime (without ‘s’) collocate strongly: Continue reading