"Let’s try them in a sentence" vs. "Let’s try them in some sentences"

Question

A tutorial introduces some rules about pronunciation

when one word ends with a consonant sound, and the next word starts with the same consonant sound, we link the sounds.

And then some exceptions are introduced

But, there are two exceptions to this rule: we don’t link /tʃ/ or /dʒ/ sounds ...

to given some examples to practice, the speaker says

Let’s try them in a sentence

Using "them" to refer to "two exceptions" is reasonable. However, she gives two sentences after then.

Should she say the following?

Let’s try them in some sentences

Answer 1

Let’s try them in a sentence

Would mean a singular sentence.

Let’s try them in some sentences

Would mean multiple sentences.

So yes, she should have said the some sentences.