Anonymous I have no clue about when to use singular or plural form. You can use these: put theory into practice (theory is uncountable) put theories into practice (theory is countable0 The damage from pollution includes climate change (this refers to damage you have mentioned previously; change is uncountable) Damage from pollution includes climate change (this refers to damage in general) (The) damage from pollution includes climate changes (change is a count noun)
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AnonymousI have no clue about when to use singular or plural form.You can use these:
AnonymousMay I ask when i should use the subject ( theory, climate change) as countable or uncountable?For the most part, it is your style decision, but you must decide whether you are talking about the concept in general or a specific single or plural instance of it.