Taking part in a normal conversation is really very difficult for deaf and blind children.
For a normal hearing child, learning to speak is an easy process.
They are constantly subjected to spoken words from the others and then can easily harvest those in their own speech.
How ever for children like Helen, its a long and sometimes painful process. But, what ever the process be, the result is as wonderful as ever.

For the deaf and blind children, this learning may often take several years.
 It's very difficult for them to find the right amenities of speech.
They're not able to distinguish among the tone of the speaker, nor can they get the emphasis of words.
Also, these children aren't able to check the expression of the speaker. This is a major disadvantage, as the look is often the soul of what one says.