I/you/we/they have been investigating. He/she/it has been investigating.
The present perfect progressive tense of the verb "to investigate" is "have been investigating."
The present tense of "investigate" is "investigates."
The present perfect tense of the verb "search" is "have searched" or "has searched."
The past tense of "inform" is "informed" and the present tense is "inform."
The future perfect tense of "search" is "will have searched."
The present tense of "inform" is "inform."
The past perfect progressive tense of "to 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 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
The five progressive tenses in English are: present progressive (e.g., I am eating), past progressive (e.g., She was watching), future progressive (e.g., They will be sleeping), present perfect progressive (e.g., We have been studying), and past perfect progressive (e.g., He had been working).
Present perfect progressive tense.
"Has been singing" is in the present perfect progressive tense. "Is singing" is the present progressive tense.
The present perfect progressive tense of print is:I/You/We have been printing.He/She/It has been printing.
The present perfect progressive tense of "clean" is "have/has been cleaning."
The present perfect progressive tense of "investigate" is "has been investigating."
The past perfect progressive tense is formed with the auxiliary verbs had + been and a present participle. The past perfect progressive tense of dance is had been dancing.
Have/has been planning is the present perfect progressive of plan.I/We/You/They have been planningHe/She/It has been planning
Present perfect progressive - have been abiding. Past perfect progressive - had been abiding. Future perfect progressive - will have been abiding.