I had been hoping somebody would ask that.
Use past progressive tense to indicate an action that was ongoing in the past. Use past perfect progressive tense to show a continuous action that started before a certain point in the past and continued up to that point.
present perfect progressive
The past perfect progressive tense of "to investigate" is "had been investigating."
The past progressive of "think" is "was thinking" or "were thinking." The past perfect of "see" is "had seen."
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
Past progressive tense.
the form of the past tense are past progressive,past perfect progressive,past perfect simple.
The past perfect progressive tense of "look" is "had been looking."
Present: show, Past: showed, Future: will show, Present Continuous: is showing, Present Perfect: has shown, Present Perfect Continuous: has been showing, Past Continuous: was showing, Past Perfect: had shown, Past Perfect Continuous: had been showing, Future Continuous: will be showing, Future Perfect: will have shown, Future Perfect Continuous: will have been showing.
Yes, had been cleaning is the past perfect progressive tense of clean.
The past progressive (past continuous) is "was visiting." (were visiting) The past perfect progressive is "had been visiting."
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).