Answer
The lewis structure is shown in the picture.
Work Step by Step
1) connect the atoms to each other in the sequence it is shown in the structural formula.
2) Count the number of valence electrons involved in the bonding, which is 12. There should be 1+1+1+4+4+6+1= 18. So make one more bond between O and C.
3) Now there are 14 e.
4) Since C and H have already made the max number of bonds they can make, make one more bond between C and O. Place the remaining electrons as 2 lone pairs on O.
4) Now count the valence electrons, it should be 18e.
