Opinions on grammatical categories

Here you have a list of opinions about grammatical categories and you can also give us your opinion about it.
You will see other people's opinions about grammatical categories and you will find out what the others say about it.
Also, you will see opinions about other terms. Do not forget to leave your opinion about this topic and others related.

In the image below, you can see a graph with the evolution of the times that people look for grammatical categories. And below it, you can see how many pieces of news have been created about grammatical categories in the last years.
Thanks to this graph, we can see the interest grammatical categories has and the evolution of its popularity.

What do you think of grammatical categories?

You can leave your opinion about grammatical categories here as well as read the comments and opinions from other people about the topic.
It's important that all of us leave our opinions about grammatical categories to have a better knowledge about it: