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Drawing the Lewis Structure really helps because then you can visually see where the signs are coming from, if there are no charges then you would see it from the molecule being drawn and if there are charges they can easily be labeled on the Lewis Structure and understood why they are there.
Also, you can draw the vectors of the dipole moments to see if they cancel in each direction. Usually, if more than two elements are used in a molecule that isn't balanced on each side, it is polar.
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