I can write upper case letter I
I can write lowercase letter i

Uppercase!

I - I - Insect
I - I - Igloo
I - I - Ink
I - I - Iguana

Oh! I know so many words
That begin with letter I

Lowercase!

i - i insect
i - i igloo
i - i ink
i- i iguana

Oh! I know so many words
That being with the letter I