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my subject is compassion, should i use "it will last" or "it will lasts", thanks
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It will last.

Simple future uses the base form, or "bare infinitive."

"Lasts" is used only in simple present, third person singular. "It usually lasts for three days."
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Anonymousmy subject is compassion, should i use "it will last" or "it will lasts", thanks

Watch for these punctunation and capitalization mistakes highlighted in red:

My subject is compassion,<period> should i use "it will last", or "it will lasts", < not comma, but question mark>. thanks