You must change 'them' to 'it'.
And if you use the countable word pieces, then you can use them.I have some pieces of toast. I want to eat them. . . .
I have some candies. I want to eat them.
"Candies" is countable. So I use "them" instead of"it". Am I right?
More likely:
I have some candy. I want to eat it.
Or:
I have some candy. I want to eat some.
Why do you use 'candy' instead of 'candies'?
Because the word candy is not considered a count noun in my area (USA). (It can be, but it usually isn't.) When I go the store I might buy a candy bar. Several items might be referred to as candy.
In British English candies is more likely. However, that word doesn't come natural to me. (A count noun I might use is treats.)
Does that help?
No, it isn't. As emsr2d2 almost said, 'candies' isn't used at all in BrE.In British English candies is more likely.
It means that it's wrong to use "candies" in all situations. Am I right?