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