Absolute infinitive is sometimes the three-letter root and sometimes the three-letter root with ו inserted between the second and the third letter.
It may be used near the same verb in perfect or imperfect with the meaning of emphasizing.
Sometimes absolute infinitive is before a perfect or imperfect, rarer (when there are no direct object) after one.
Perfect or imperfect with two absolute infinitives (one of the same root as the perfect or imperfect and other of an other root) may be translated as a gerund.
In absolute infinitive the last ה in the root is not replaced with ות.