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"Depend" expresses uncertainty or condition; "rely" expresses firm trust in someone or something.
Side-by-side comparison
To depend on an uncertain condition, or to need something/someone. Always followed by "on".
Whether we go to the beach depends on the weather.
It depends, what time are you planning to leave?
Children depend on their parents for everything in the early years.
To firmly trust in something or someone. Implies that person or thing is dependable. Followed by "on".
You can rely on her. She always keeps her promises.
I rely on public transport to get to work every day.
Do not rely solely on one source of income.
Common mistake
- •"Depend on" and "rely on" are nearly interchangeable, but "rely on" always carries a positive connotation of active trust.
- •"She depends on others" can imply excessive dependence; "She relies on others" implies she trusts them with good reason.
Trick to remember it
- •To praise someone's reliability: "You can rely on her".
- •To describe a condition without judgment: "It depends on the weather".
- •"Rely" = I actively trust.
- •"Depend" = I am conditional or in need.
Quick rule
- •"Depend on" = to be conditional on or in need of (neutral).
- •"Rely on" = to firmly trust someone or something reliable (positive).
Did you know?
"Reliable" comes from "rely" + "-able". "Dependable" comes from "depend" + "-able". Interestingly, as adjectives both form nearly synonymous words used interchangeably: "a reliable car" = "a dependable car". But the verbs diverge more in usage. Reliability as a quality unites them; verbal usage distinguishes them.
Practise what you learned
Exercise 1 · Pick the right one
You can always _____ on her. She never lets anyone down.
Exercise 2 · Pick the right one
"Will you come to the party?" "It _____ s on whether I finish work in time."
Exercise 3 · Form the word
Related word pairs
"Care" is to find something important or to look after someone; "worry" is to feel anxious about something that might go wrong.
One desires something possible, the other desires something impossible or contrary to reality.
"Think" expresses an opinion or assumption; "believe" expresses conviction or faith.
"Above" is at a higher level without contact; "over" implies covering, movement, or crossing.
Bryan López
Founder of SpeakUP Academy