past tense of lighten is lightened.
|Simple / Indefinite Present Tense
|He/She/It lightens .
|Present Continuous Tense
|He/She/It is lightening.
|I am lightening.
|You/We/They are lightening.
|Present Perfect Tense
|He/She/It has lightened.
|I have lightened.
|You/We/They have lightened.
|Present Perfect Continuous Tense
|He/She/It has been lightening.
|I have been lightening.
|You/We/They have been lightening.
|Simple Past Tense
|Past Continuous Tense
|He/She/It was lightening.
|I was lightening.
|You/We/They were lightening.
|Past Perfect Tense
|He/She/It had lightened.
|I had lightened.
|You/We/They had lightened.
|Past Perfect Continuous Tense
|He/She/It had been lightening.
|I had been lightening.
|You/We/They had been lightening.
|Simple Future Tense
|He/She/It will/shall lighten.
|I will/shall lighten.
|You/We/They will/shall lighten.
|Future Continuous Tense
|He/She/It will/shall be lightening.
|I will/shall be lightening.
|You/We/They will/shall be lightening.
|Future Perfect Tense
|He/She/It will/shall have lightened.
|I will/shall have lightened.
|You/We/They will/shall have lightened.
|Future Perfect Continuous Tense
|He/She/It will/shall have been lightening.
|I will/shall have been lightening.
|You/We/They will/shall have been lightening.
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