Keep an eye on vs Monitor vs Supervise vs Watch

When to use each in English, with meaning, register, and examples.

Keep an eye on

Top 2,000 (common)

Monitor

Top 2,000 (common)B2noun

Supervise

Top 2,000 (common)C1verb

Watch

Top 1,000 (very common)A1verb
Most common: Watch
 Keep an eye onMonitorSuperviseWatch
Pronunciation🇬🇧 //kiːp ən aɪ ɒn//🇺🇸 //kip ən aɪ ɑn//🇬🇧 /["/ˈmɒnɪtə(r)/"]/🇺🇸 /["/ˈmɑːnɪtər/"]/🇬🇧 /["/ˈsuːpəvaɪz/","/ˈsuːpəvaɪzɪz/","/ˈsuːpəvaɪzd/","/ˈsuːpəvaɪzɪŋ/"]/🇺🇸 /["/ˈsuːpərvaɪz/","/ˈsuːpərvaɪzɪz/","/ˈsuːpərvaɪzd/","/ˈsuːpərvaɪzɪŋ/"]/🇬🇧 /["/wɒtʃ/","/ˈwɒtʃɪz/","/wɒtʃt/","/ˈwɒtʃɪŋ/"]/🇺🇸 /["/wɑːtʃ/","/ˈwɑːtʃɪz/","/wɑːtʃt/","/ˈwɑːtʃɪŋ/"]/
Meaningto watch or pay attention to someone or somethingA screen used to see pictures or text from a computer.To watch over and manage people or activities.To look at something for a period of time.
ExampleCan you keep an eye on the kids while I cook?The teacher will monitor the students' progress throughout the semester.to supervise building workI love to watch movies on the weekends.
RegisterNeutralNeutralNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)Top 2,000 (common)Top 1,000 (very common)
CEFR level-B2C1A1
Part of speechnounverbverb
Collocationskeep an eye on someone, keep an eye on something, keep a close eye oncolour/​color, digital, CCTV, on a/​the monitor, baby, foetal/​fetal, heart, detect something, display something, show something, hooked up to a monitor, UN, ceasefire, election, UN, ceasefire, electioncarefully, closely, directly, appoint somebody to, be responsible for supervising somethingcarefully, closely, attentively, could only, continue to, pause to, for, from, in, sit and watch, stand and watch, watch and wait
Antonymsignore, neglectignore, neglectneglect, ignoreignore, overlook, neglect
Common mistakesConfusing with 'watch over', which means to protect instead of just monitor., Using in overly formal situations where simpler phrases would work better.Confused with 'minotor', a common misspelling., Using 'monitor' as a verb without an object, e.g., 'I will monitor' instead of 'I will monitor the situation.'Confused with 'supervisor' - remember 'supervise' is the action, while 'supervisor' is the person., Using 'supervise' in informal contexts where 'help' or 'watch' would be better., Omitting the object - 'supervise' should always have something that is being supervised.'Watched' vs 'watching': confusing past and present forms., 'Watch' is not used with 'something': saying 'watch something' instead of just 'watch'., Using 'watch' for inanimate objects like books, instead of 'read'.
Usage notesUse in contexts where you need to monitor someone or something. More casual than 'observe'.Use 'monitor' when referring to computer screens or when talking about observing something continuously. More formal contexts may use it to describe supervision or tracking.Used in professional or educational contexts. Avoid using it in casual conversations where simpler terms like 'watch' may be more appropriate.Used for looking at moving images or events. More formal contexts may use 'view' instead, while 'watch' is appropriate in casual conversations. Avoid using in highly formal writing.

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Keep an eye on
Monitor
Supervise
Watch

Frequently asked questions: Keep an eye on vs Monitor vs Supervise vs Watch

What's the difference between Keep an eye on, Monitor, Supervise, and Watch?

Keep an eye on: to watch or pay attention to someone or something Monitor: A screen used to see pictures or text from a computer. Supervise: To watch over and manage people or activities. Watch: To look at something for a period of time.

Which is more common: Keep an eye on, Monitor, Supervise, and Watch?

Watch is the most common in everyday English.

Which is more advanced: Keep an eye on, Monitor, Supervise, and Watch?

Supervise is the highest level, at C1, on the CEFR scale.

Can you show an example of each?

Keep an eye on: Can you keep an eye on the kids while I cook? Monitor: The teacher will monitor the students' progress throughout the semester. Supervise: to supervise building work Watch: I love to watch movies on the weekends.

Can I use Keep an eye on, Monitor, Supervise, and Watch interchangeably?

Not always. Keep an eye on, Monitor, Supervise, and Watch are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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