1
patrol + noun (place)
patrol 作及物动词时，直接接巡逻的地点，不加介词。
Police patrol the streets every night.
警察每晚巡逻街道。
巡逻；巡查
patrolling — present participle of patrol
先理解核心含义，再看它在真实句子里的用法。
巡逻；巡查
to go around an area, especially on duty, to guard or supervise it
Police patrol the streets every night.
警察每晚巡逻街道。
沿哨兵线巡查；巡查警区或巡逻区。
To go the rounds along a chain of sentinels; to traverse a police district or beat.
像哨兵、警卫或警察那样巡回。
To go the rounds of, as a sentry, guard, or policeman
patrol
Base
原形
patrols
3rd person
第三人称单数
patrolling
-ing
现在分词
patrolled
Past
过去式
patrolled
Past participle
过去分词
The guards patrol the perimeter every hour.
警卫们每小时巡逻一次周边。
A police car patrolled the streets all night.
一辆警车整夜在街上巡逻。
Two officers are patrolling the area right now.
两名警察此刻正在该区域巡逻。
动词 patrol 是规则动词，但加 -ed 或 -ing 时需双写末尾的 l。
Security guards patrol the mall every night.
保安每晚巡逻商场。
The police patrolled the streets during the festival.
节日期间警察在街上巡逻。
A soldier is patrolling along the border.
一名士兵正在边境沿线巡逻。
patrol 作及物动词时，直接接巡逻的地点，不加介词。
Police patrol the streets every night.
警察每晚巡逻街道。
不及物用法中，可用介词短语标明巡逻路线。
The guards patrolled along the perimeter.
警卫沿着周边巡逻。
被动语态用 be + patrolled，patrolled 是过去分词，注意拼写为双写 l。
The park is patrolled by security guards.
公园由保安巡逻。
Not this
The police patrols the streets every night.
Use this
The police patrol the streets every night.
police 是集合名词，永远是复数，谓语动词要用原形 patrol，不能加 -s。patrols 只用于 he/she/it 这类单数第三人称主语。
Not this
The soldiers patrol the village yesterday.
Use this
The soldiers patrolled the village yesterday.
yesterday 表示过去时间，动词必须用过去式。patrol 的过去式是 patrolled，先双写 l 再加 -ed；不能因为中文动词没有时态变化而用原形 patrol。
Not this
The police are patrol the streets.
Use this
The police are patrolling the streets.
are 后面要构成现在进行时，必须用现在分词 patrolling，而不是动词原形 patrol。英语进行时的结构是 be + -ing 形式，中国学习者容易受中文‘正在巡逻’影响漏掉 -ing。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
在街道上巡逻
Two officers patrol the streets every night.
两名警察每晚在街道上巡逻。
在边境巡逻
Soldiers patrol the border to prevent illegal crossings.
士兵们在边境巡逻，以防止非法越境。
在区域巡逻
Security guards patrol the area after dark.
保安在天黑后在该区域巡逻。
徒步巡逻
Police usually patrol on foot in the city center.
警察通常在市中心的街道上徒步巡逻。
Use patrolling naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记法：想象巨魔（troll）在沿街巡逻，patrol 的后半部分读音就是 troll。
语域：neutral 常见场景：police patrol、military patrol、security guard patrol 该义项通常为中性用语，多用于警察、军队或保安等巡视区域、执行巡查任务的场合。
All six words share the stressed /oʊl/ sound, and 'patrol' (/pəˈtroʊl/) rhymes with 'control'. Beware of lookalikes like 'petrol' (/ˈpetrəl/) and 'patron' (/ˈpeɪtrən/ or /ˈpætrən/), which look similar but sound different.
Dictionary facts from ECDICT, WIKTIONARY.