The challenge of differentiation

It has been drilled into every session we have had that differentiation in classroom lessons is so important but until today I didn't see quite how hard that can be.
It didn't occur to me that the difference in ability could be so vast in one class, which has for the most part had the same school experience as everybody else.
There is some people in the class who can barely string a sentence together, whilst others are forming exciting sentences that amaze me when I see them.
It is almost like making a lesson which includes a standard Year 1 child, whilst at the same time including a standard Year 6 child.
Making three different worksheets is one thing but making it so they all learn every lesson is perhaps going to be the hardest thing to achieve this year.