1. It’s necessary to increase productivity.
  2. It’s necessary increasing productivity.
  3. It’s necessary for increasing productivity.
    Are these sentences grammatically correct?

Hi Allifathima,

I think only the first one is grammatically correct. Sentence 2 and 3 seem very odd.
For more information about the use of ‘necessary’, click the following link: oald8.oxfordlearnersdictionaries … /necessary


I want to hear your comments.

Only the first is correct. Bronstona, please don’t answer any grammar questions if you don’t know the correct answer.[YSaerTTEW443543]

TOEIC listening, photographs: Two people hugging[YSaerTTEW443543]

“It’s necessary to increasing productivity.”
Is it not correct?

No. The construction is ‘necessary’ + to + infinitive[YSaerTTEW443543]

TOEIC listening, photographs: An airport terminal[YSaerTTEW443543]