Question

e.g. Write the small letters in the alphabet continuously putting together.

Is this expression correct? Do you have some more good expressions?

Answer 1

I think you mean,

Write the small letters OF the alphabet in the correct order.

You could also say,

Write the lower case letters in alphabetical order.

Answer 2

Write the small letters in the alphabet continuously putting together in Italic script.
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What about the expression above?
Writting the letters with the pen on the paper is called what?

Answer 3

We say "letters of the alphabet."

You should say, Write the small letters of the alphabet, putting them together in italic script.