He always used to say, 'It's easy to say, but hard to do.'

He is learning how to use gerunds.

He is recognized as the alliance leader.

A common noun refers to a noun that does not point to a specific person or thing.

This company is disclosing all performance reports to enhance its transparency.

Please read this instruction manual carefully before using the product.

Her necklace had a beautiful cat's eye stone.

'Apple' is a count noun, and you can count it as one, two, etc.

Happiness is a mass noun, you can't count it.

I can't find my birth certificate.