# Also I said

The pronoun "I" refers to Nehemiah.

# What you are doing

"You" here refers to the Jewish nobles.

# Should you not walk in the fear of our God to prevent the taunts of the nations that are our enemies?

"You should walk in the fear of our God to prevent the taunts of the nations that are our enemies." 

# walk in the fear of our God

"live your life in a way that honors God" 

# the taunts of the nations that are our enemies

"the nations who are our enemies from taunting us"