Ascertined or Ascertained: How To spell?

The word Ascertined is misspelled against Ascertained, which is past tense of "Ascertain"

Word contains consecutive vowels 'AI' in between alphabets ascert & ned is misspelled as 'I'
Wrong Spelling:  ascert-i-ned 
Correct Spelling:  ascert-ai-ned 
Find more wrongly spelled words of Ascertained to spell it well.

You might be interested to know

Bilie or Bailie?

Bobtil or Bobtail?

Catian or Cataian?