否定是inexpensive，中文意思是adj. 便宜的
She found a small， inexpensive motel on the outskirts of the town it was barren and unlovely.她在鎮郊找了一個又小又便宜的汽車旅館，設施不全也不好看。
Import fees are low， so tourists enjoy inexpensive shopping.
進口費用低，所以遊客可以享受便宜的購物。
expensive是形容詞，否定的用法可以考慮這幾種種情況：
1、反義詞cheap，便宜的
2、加前綴un，unexpensive，不貴的
3、藉助be動詞，如：It isn’t expensive.
