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Both can mean 'darse cuenta', but one implies mental understanding and the other sensory perception.
Side-by-side comparison
"Realize" is to come to understand or become aware of something you did not know or had not thought about before. The awareness comes from within. "I just realized I forgot" = it just occurred to me that I forgot.
I just realized I left my keys at home.
She realized she was in love with him.
Did you realize how serious this is?
"Notice" is to perceive or detect something with your senses or attention. The perception comes from something external. "Did you notice the sign?" = did you see the sign?
Did you notice anything strange in the room?
She noticed that he was wearing a new tie.
I did not notice the sign.
Common mistake
"I realized a strange smell" is wrong: sensory perception (smelling, seeing, hearing something) uses "notice." "Realize" is for mental understanding, when something clicks in the mind: "I realized I had forgotten my keys."
Trick to remember it
- •"Realize" = mental understanding (something clicks in your mind).
- •"Notice" = sensory perception or attention (you see it, hear it, smell it).
- •Is the awareness mental or sensory?
Quick rule
- •Does the understanding come from your mind (connecting ideas)? "Realize".
- •Does the perception come from your senses (seeing, hearing, smelling)? "Notice".
Did you know?
REALIZE has a second meaning completely unrelated to "darse cuenta": "to realize a profit" (to generate or materialize a gain) and "to realize a dream" (to make a dream real). This REALIZE comes from the sense of "to make real", converting something potential into actuality. "Realize your potential" = make your potential real. American English spells it "realize"; British English "realise", both are correct. And NOTICE can also be a noun: "give notice" (to warn or resign formally), "at short notice" (with little warning), "until further notice" (until announced otherwise).
Practise what you learned
Exercise 1 · Pick the right one
I _____ d that I had left my keys at home when I reached the door.
Exercise 2 · Pick the right one
She _____ d a strange smell coming from the kitchen and went to check.
Exercise 3 · Form the word
Related word pairs
One is recalling something yourself, the other is making someone else recall it.
"Above" is at a higher level without contact; "over" implies covering, movement, or crossing.
'Currently' means 'at the present time'; 'actually' means 'in reality', not 'nowadays'.
"Actually" corrects or contrasts an assumption; "really" intensifies or confirms.
Bryan López
Founder of SpeakUP Academy