Recommended by Melissa França
"FEWER" and "LESS"
"Fewer" is used for countable items. "Less" is used for uncountable quantities. Ex.: We need fewer chairs. There is less water in the bottle.
"WEATHER" and "WHETHER"
"Weather" refers to the atmospheric conditions. "Whether" is used to introduce alternatives or choices. Ex.: The weather is perfect for a picnic. I'm not sure whether to wear a jacket or not.