Each other

Tonight in class someone made a very common error:

• We checked our presentations each other.

"Each other" is a reciprocal pronoun, so it takes the place of the pronoun "our" and comes before the direct object (目的語). So this is correct:

• We checked each other's presentations.

If there is no other pronoun (like "our"), then it can come at the end:

• Emi and Ken are Japanese but speak English with each other.

If you have a group, you need to use "one another", so this means there were 3+ people:

• We practiced speaking English with one another.

Please use English well!