Write the net ionic equation for hclo4(aq) + naoh(aq) --> h2o (l) + naclo4(aq).

Net ionic equation for
HClO4(aq) + NaOH(aq) --> H2O (l) + NaClO4(aq).

for the molecular equation 

HClO4 (aq) + NaOH(aq) --> H2O (l) + NaClO4 (aq) 

the ionic equation is 

H+ + ClO4- + Na+ + OH- --> H2O(l) + Na+ + ClO4- 

now remove the spectator ions (Na+ and ClO4-) to give the net ionic equation 

H+ + OH- --> H2O(l)

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more