I'll check on that and I wi get back to you.

  1. Crocodile will vomit out the animal they ate and then will eat it again.
  2. I’ll check on that and I wi get back to you.
  3. The winter this year is not as cold as last year.

Are the above sentences correct?

I’d find the following more acceptable:

  1. Crocodiles vomit out the animals they have eaten, and then eat them again.
  2. I’ll check it out and get back to you.
  3. The winter this year is not as cold as that last year.

Alternative vocabulary for (1)
Crocodiles regurgitate the animals they have eaten, then eat them again. (the ‘and’ is not necessary.)

  1. Does not require a change from ‘on that’ to ‘it out’. Changing it like that actually gives the sentence a slightly different meaning.
    I’ll check on that and get back to you.

  2. Much simpler and more natural to say:
    This winter is not as cold as last winter.