Past Perfect
It had improved my English;

Rationale: Past action (PA)
A PA finnished before another PA
A time period before a point in the past
imaginary things in the past
Like Present Perfect,
with 'had' instead of 'have'
Positive | affirmative
Negative & Question structure like
Present Perfect too
When you got here, the class had already started.
When his string broke, he had been jamming for hours.
I wish I had better prepared for this.
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