"Had never I seen that beautiful sunset."

• Inversion

• Normal sentence

• Wrong

Answer explanation

Inversion: to change the normal sentence order.

(Negative) Adverbial + Auxiliary + Subject + Main verb

I couldn't find a public bathroom anywhere.

• Inversion

• Normal sentence

• Wrong

At no time did she offer to pay for gas.

• Inversion

• Normal sentence

• Wrong

Not once did she offer to pay for gas.

• Inversion

• Normal sentence

• Wrong

I rarely see people reading newspapers.

• Inversion

• Normal sentence

• Wrong

hardly had the students started their exam when the fire alarm went off.

• Inversion

• Normal sentence

• Wrong

Barely had we pitched our tent when a gust of wind blew it over.

• Inversion

• Normal sentence

• Wrong

Under no circumstances must you show anyone this letter.

• Inversion

• Normal sentence

• Wrong

Not only does Mara speak English and Italian but she's also learning Khmer.

• Inversion

• Normal sentence

• Wrong

Sometimes had I felt so frightened before.

• Inversion

• Normal sentence

• Wrong

Answer explanation

Sometimes is not negative adverb.