Practicing the Letter ऐ (ai)
Practice saying the words below, noting the difference between the vowel ै (ai) and the letter ौ (au).
Always be aware of the similarities between ै and ौ and note their differences.
You should be comfortable with the concept of vowel mātrās by now, so it should be no surprise to see the change from ऐसा to कैसा simply because in the second word the first vowel does not appear as the first letter.
This is the end of the letters presented in the Devanagari tutorial as it existed in 1998. Now that the 2013 revision has taken place, please check back for the addition of more letters.