used

"the principle of surprise is the most used and misused of all the principles of war"

"after going out of his way to help his friend get the job he felt not appreciated but used"

"bought a secondhand (or used) car"

误 She was used to get up early.

正 She was used to getting up early.

析 be used to后可接动名词,不可接动词不定式。

误 Papers are used to expressing public opinion here.

正 Papers are used to express public opinion here.

析 在这里used是动词的被动结构,表示“被利用来做…”,因此,其后应接动词不定式。