Had been investigating.
we were planning: past progessive tense we are planning: present progressive tense We will have planned.: Future perfect tense
The present perfect tense is Have/Has Hidden.
The present perfect tense is has/have existed.
Was is a past tense conjugation of be. The present perfect tense of be is have/has been.I/We/You/They have beenHe/She/It has been
"have tried" is the present perfect tense.
I/you/we/they have been investigating. He/she/it has been investigating.
Have/Has been investigating.
we were planning: past progessive tense we are planning: present progressive tense We will have planned.: Future perfect tense
The present tense of investigating is:I/You/We/They investigate.He/She/It investigates.The present participle is investigating.
The past perfect progressive of investigate is had been investigating.
The present progressive tense of investigate is:I am investigating.You/We/They are investigating.He/She/It is investigating.
Present tense
The present perfect tense is Have/Has Hidden.
The present perfect tense is has/have existed.
present tense past tense future tense present perfect tense past perfect tense future perfect tense present progressive tense past progressive tense future progressive tense present perfect progressive tense past perfect progressive tense future perfect progressive tense
Was is a past tense conjugation of be. The present perfect tense of be is have/has been.I/We/You/They have beenHe/She/It has been
The present perfect tense of "are" is "have been."