Dear all,

Please look at these sentences:

>Don't tell us the answer. We'll work it out for ourselves.

>Can I change the word 'for' to 'by' or omit it altogether without changing the original meaning of the sentence?

yes... for, by, or no preposition at all would give virtually the same sentence.

we will work it out for ourselves
we will work it out by ourselves
we will work it out ourselves
Could you possibly give us an example?
Students: We have free audio pronunciation exercises.
 moijelesuis's reply was promoted to an answer.