city – chung shih
Written as chéngshì or chengshi
To remember that city is pronounced chung shih (chengshi) in Mandarin Chinese, use the following mnemonic:
He bought the whole city with a huge chunk of gold carried by a ship (chung shih).

Tones
1. Chung (chunk) is a 2nd tone with / as an accent.
Associate chunk, a 2nd tone, with a balloon filled with helium or anything that goes up. See Tones and Mnemonics.

The chunk of rock was blasted into the air.
2. Shih (ship) is a 4th tone with \ as an accent.
Associate ship, a 4th tone, with lowering things like trip or slide down. See Tones and Mnemonics.

The ship fell out of the sky.
Remember
chung = 2nd tone = /
Shih = 4th tone = \