Know what to do vs Recognize

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

Know what to do

Top 2,000 (common)

Recognize

Top 1,000 (very common)A2verb
Most common: Recognize
 Know what to doRecognize
Pronunciation🇬🇧 //nəʊ wɒt tə duː//🇺🇸 //noʊ wɑt tə du//🇬🇧 /["/ˈrekəɡnaɪz/","/ˈrekəɡnaɪzɪz/","/ˈrekəɡnaɪzd/","/ˈrekəɡnaɪzɪŋ/"]/🇺🇸 /["/ˈrekəɡnaɪz/","/ˈrekəɡnaɪzɪz/","/ˈrekəɡnaɪzd/","/ˈrekəɡnaɪzɪŋ/"]/
MeaningUnderstand the correct actions to take in a situation.to see or know someone or something again
ExampleWhen faced with a big decision, it's important to know what to do.I can recognize her voice even when she is not in the room.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 1,000 (very common)
CEFR level-A2
Part of speechverb
Collocationsknow what to do next, know exactly what to do, know what to do in case of emergencyimmediately, instantly, correctly, learn to, be easy to, as, by, from, clearly, fully, belatedly, must, need to, begin to, as, be commonly recognized, be generally recognized, be universally recognized, clearly, federally, formally, agree to, refuse to, as, be legally recognized, a refusal to recognize something
Antonyms-ignore, overlook, miss
Common mistakesConfusing with 'knowing what to do' as a noun phrase., Using it in a past tense incorrectly, such as 'knew what to do.', Forgetting to pair it with an action verb.Confusing 'recognize' with 'realize', Using 'recognize' without an object (e.g., 'I recognize' instead of 'I recognize her'), Mixing up tenses, like saying 'recognized' instead of 'recognize' in present situations
Usage notesUse in both spoken and written language when advising or reassuring someone. Avoid in overly formal contexts.Use 'recognize' when acknowledging something you already know. It's appropriate for everyday conversations but avoid in situations requiring formal language, like legal documents.

See it in real clips

Know what to do
Recognize

Frequently asked questions: Know what to do vs Recognize

What's the difference between Know what to do and Recognize?

Know what to do: Understand the correct actions to take in a situation. Recognize: to see or know someone or something again

Which is more common: Know what to do and Recognize?

Recognize is the most common in everyday English.

Can you show an example of each?

Know what to do: When faced with a big decision, it's important to know what to do. Recognize: I can recognize her voice even when she is not in the room.

Can I use Know what to do and Recognize interchangeably?

Not always. Know what to do and Recognize 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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