This or These

These is the plural form of this.

This is used to talk about singular countable noun or an uncountable noun.

These is used to talk about plural countable nouns.

  • I would like to buy this mobile phone.
    (singular countable noun/mobile phone)
  • This money belongs to my father.
    (uncountable noun/money)
  • These are my children.
    (plural countable noun/children)