I believe it to be true, as you "could" use it as "could have", have being the past tense helping verb.
Could is past tense. It is the past of can. In reported speech you could use could be to mean past.I asked him if he could be a bit quieter.
The past tense of "be" is "was/were." The present tense of "be" is "am/is/are."
Could is already the past tense. It is the past tense of the verb "can".
The past tense of can is could.
You use the past tense form which is 'had'.
Is can be used in the past tense if it's in its past tense form, which is was.
Yes, "could" is the past tense of "can." It is used to indicate past ability or past possibility.
"is' is present tense. For past tense use was or were.
Imperious is an adjective and doesn't show tense. You could use it in a past tense sentence eg Her attitude was imperious all week
No, "can" is a modal verb that denotes ability or possibility in the present tense. The past tense of "can" is "could."
"Could you please help me" is in present tense. The word "could" is used as a polite way to make a request in present time.
The past tense is could.