Can we construct below sentences?

a) System does not calculating it correctly.

b) System is not calculating it correctly.

1 Answer 1


You can use either, but they should be written as follows:

  • The system does not calculate it correctly.
  • The system is not calculating it correctly.

"Is" is a present tense form of the verb to be, so you can use it to describe the present state of someone or something. "Calculating" matches that tense.

"Does", the third person singular present of do, denotes the action of something, not a state. This is why "calculate" does not need to be in the present participle.

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