The past tense is investigated.
The past perfect progressive of investigate is had been investigating.
I will/shall investigate
the past tense of am is was and the past tense of has is had
The past tense of "has" is "had" and the past tense of "have" is "had."
The present progressive tense of investigate is:I am investigating.You/We/They are investigating.He/She/It is investigating.
The present tense of investigating is:I/You/We/They investigate.He/She/It investigates.The present participle is investigating.
Was and were are both the past tense of be. The present tense is: I am he is you are they are The past tense is: I was he was you were they were
"will be" is the future tense of "be". The past tense of "be" is "was/were".
The past tense is she did.
The word "were" is past tense. It is the past tense of the verb "to be."
The past tense of "will" is "would". The past tense of "to be" is "was" or "were".
The present perfect progressive tense of "investigate" is "has been investigating."