Is It Interest or Interests?

You use interest as a countable when you refer to it as an activity that you enjoy doing or spend time to learn about. It also refers to something that brings advantage to you. For example, basketball and table tennis are his interests. He looks after his own interests.

Is interest singular or plural?

The noun interest can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be interest. However, in more specific contexts, the plural form can also be interests e.g. in reference to various types of interests or a collection of interests.

Are interests grammatically correct?

'interests me ' is grammatically correct same as ' I'm interested in '. Mistakes are not ,all the time, in grammar , it's sometimes in choosing the suitable word or expression for the right meaning or context.