Correct the punctuation and rewrite the sentences using inversion and joining techniques as demonstrated.

i) To punctuate correctly, the direct speech needs quotation marks and a comma before the reporting clause.

The correctly punctuated sentence is:
"Do not give in to peer pressure," the IG advised his police officers.
"Do not give in to peer pressure," the IG advised his police officers.

ii) To begin with "Never" and retain the meaning, an inversion structure is used.

The rewritten sentence is:
Never before had our MPs voted to impeach a Cabinet Secretary.
Never before had our MPs voted to impeach a Cabinet Secretary.

iii) To join the sentences starting with "Hardly," an inverted structure with "had" and "when" is used.

The joined sentence is:
Hardly had the party started when the police officers arrived.
Hardly had the party started when the police officers arrived.

iv) This is the same as part i). To punctuate correctly, the direct speech needs quotation marks and a comma before the reporting clause.

The correctly punctuated sentence is:
"Do not give in to peer pressure," the IG advised his police officers.
"Do not give in to peer pressure," the IG advised his police officers.