Have been improving.
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Have been improving is the present perfect progressive tense conjugated for first and second person singular and first, second, and third person plural.
The present perfect tense of improve:
I have improved
You have improved
He/she/it has improved
We have improved
They have improved
The present perfect tense of "improve" is "has improved" or "have improved", depending on the subject.
The perfect tense of the verb "dig" is "have dug" or "has dug."
The 6 forms of perfect tenses are: present perfect, past perfect, future perfect, present perfect continuous, past perfect continuous, and future perfect continuous.
The tense that uses "had" is the past perfect tense, while the tense that uses "have" is the present perfect tense.
The present perfect tense of "was" is "have been".
The present perfect tense of "hid" is "have/has hidden."
I/We/You/They have improvedHe/She/It has improved
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 perfect tense of the verb "dig" is "have dug" or "has dug."
Present Tense, Paste Tense, Future Tense, Future Perfect Tense, Present Perfect Tense, Past Perfect Tense
The 6 forms of perfect tenses are: present perfect, past perfect, future perfect, present perfect continuous, past perfect continuous, and future perfect continuous.
Present perfect tense - have/has gone. Present perfect continuous tense - have/has been going. Past perfect tense - had gone. Past perfect continuous tense - had been going. Future perfect tense - will have gone. Future perfect continuous tense - will have been going.
The tense that uses "had" is the past perfect tense, while the tense that uses "have" is the present perfect tense.
The past tense of improve is improved.
The present perfect tense of "was" is "have been".
The past perfect tense of hope is had hoped.
The present perfect tense of "hid" is "have/has hidden."
The future perfect tense of "know" is "will have known."