Dew is known as the moisture in the air that settles on plants at dawn resulting in drops.
"The morning dew feels cold on my skin."
Do means to execute or perform an action as a result of your influence on them.
"I made him do the dishes after the meal."
Doo is the misspelling of the word, do. An extra letter makes it redundant in the long run.Due means having reached the stipulated, scheduled, expected and appropriate time.
"The baby is just about due."