second-person singular simple present form of long
"You long for peace every night."
In plain English: To make something last for an unusually long time is to prolong it.
"The longest does not exist because longest is an adjective, not a verb."
superlative form of long: most long
"The longest river in our country flows through three different provinces."
In plain English: Longest means having more length than anything else being compared to it.
"She walked down what seemed like the longest street in town without seeing any shops."
Usage: Use the superlative adjective longest to describe one item as having more length than all others in a specific group. Do not use it for general comparisons, which require the comparative form longer.
superlative form of long: most long
"The marathon runner held the longest time in the race until he crossed the finish line first."
In plain English: Longest is used to describe something that has more length than anything else being compared.
"It took her longest to finish that last chapter."
A surname.
"The Longest family has lived in that valley for generations."