Past Tense of “let”
The past tense of let is let; the past participle is let.
Why “let” behaves this way
"Let" descends from Old English "lætan," a strong verb belonging to the same ancient reduplicating class as "hold" — historically it had a more complex conjugation before centuries of leveling collapsed all three forms down into the single, unchanging modern shape "let/let/let." Its zero-change pattern today isn't a sign that "let" was always simple; it's the end result of an originally more elaborate strong-verb paradigm eroding down to the shortest possible form over roughly a thousand years.
Old English "lætan" actually had two nearly opposite senses that both survive in modern English: "to allow" (its dominant modern meaning) and "to hinder or prevent," a sense that lingers today only in the specialized tennis term "let" (as in a "let serve," one that's replayed because it clipped the net) — meaning "let" is one of the rare English words whose old and new meanings are close to opposites of each other, both still technically in use in different specialized contexts.
The common confusion
Because all three forms are identical, the conjugation itself never confuses anyone; the real point worth knowing is the causative grammar "let" requires — "let someone do something" uses the bare infinitive with no "to" ("let him go," never "let him to go"), the same exception shared by "make" and a small handful of other causative and perception verbs.
How it's actually used
"Let" carries a specialized meaning in British English real estate — "to let" a property means to rent it out to a tenant, seen commonly on "To Let" signs in the UK, distinct from the more general American sense of "rent," which covers both renting out and renting from. "Let" also forms the fixed grammatical construction that opens a suggestion or proposal ("let's go," a contraction of "let us go"), one of the most frequent imperative-adjacent phrases in everyday spoken English. In poker and other games, "let it ride" means leaving a bet or a previous decision unchanged rather than adjusting it, a gambling-derived idiom now common in general business speech to mean sticking with an existing plan.
Across the tense system
"Let" is unusual among causative verbs for how thoroughly its meaning depends on context rather than tense — "let him go" can mean literally releasing someone's hand, allowing someone to leave, or firing them from a job, three entirely different meanings carried by the identical words and identical zero-change conjugation, distinguished only by surrounding context. "Let down" as a phrasal verb describes disappointing someone, entirely distinct from the literal sense of lowering something, and both share the identical unchanging let/let/let conjugation regardless of which meaning is intended.
Common real mistakes
A frequent learner error is inserting "to" after the causative "let" ("let him to go" instead of "let him go"), the same mistake that occurs with "make," typically among speakers whose first language requires an infinitive marker in the equivalent construction. A separate, real confusion in British English specifically is "let" versus "rent" — using American "rent out" where British convention prefers simply "let" a property, a dialectal mismatch rather than a grammatical error. Learners occasionally confuse "let" with "leave" in the fixed expression "let alone" versus "leave alone" — "let alone" means "much less" or "never mind" ("I can barely afford rent, let alone a vacation"), while "leave alone" means to stop bothering someone, two idioms that share no grammatical relationship despite their surface similarity.
Examples
- She let the kids stay up late on Friday.
- They have let the apartment sit empty for months.
- He let go of the rope too soon.
- We had let the fire die down before we noticed.
- The landlord lets three units in this building.
- Let me know if you need anything.
- It's letting up outside.
- They're letting the dough rest for an hour.
Memory trick
Group "let" with "put," "cut," and "hit" as verbs whose form never changes at all across every tense — one shape does all the work. And remember the causative rule: after "let," drop "to" completely, the same exception "make" follows.