Ascertianing or Ascertaining: How To spell?

The word Ascertianing is misspelled against Ascertaining, which is present continuous of "Ascertain"

Word contains consecutive vowels 'AI' in between alphabets ascert & ning is misspelled as 'IA'
Wrong Spelling:  ascert-ia-ning 
Correct Spelling:  ascert-ai-ning 
Find more wrongly spelled words of Ascertaining to spell it well.

You might be interested to know

Bialing or Bailing?

Boniar or Bonair?

Certian or Certain?