PRESENT PERFECT TENSE
ADDING INTERROGATIVE WORDS BEFORE POSITIVE INTERROGATIVE SENTENCE
INTERROGATIVE WORDS+HAVE +SUBJECT+V3 +OTHER WORDS
What + have I done? What have I done?
Where Where have I done?
Why Why have I done?
How How have I done?
When When have I done?
Which Which work have I done?
What + has he done? What has he done?
Where Where has he done?
Why Why has he done?
How How has he done?
When When has he done?
Which Which work has he done?
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