I would like to say that the flexibility of the model is reduced as the dimension of the data increase.

The flexibility of model A reduces as the dimension increases.

Is that correct or do I need to write it as follows:

The flexibility of model A reduce as the dimension increase.

Could someone help me to understand which one is correct and why, please? As I learned, I need to have s with my verb.


A is singular not plural therefore flexibility of model "A" which is the subject REDUCES.

If it were "flexibility of the model A and B reduces" it would've been wrong, because A and B are 2 things thus it should be REDUCE.

Only introduce an S to the verb when talking about a single object or person.

There shouldn't be an S when addressing more than 2 objects or 2 people.

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