JLPT N3 grammar · Chapter 7

～に基づいて・～に基づく

Base something on evidence, rules, or data

You’ll be able to say that an action, decision, or statement is based on reliable information or a standard.

Read it first

地図ちずの案内あんないデータに基もとづいて、無理むりのない登山とざん計画けいかくを立たてました。

chizu no annai deeta ni motozuite, muri no nai tozan keikaku o tatemashita.

What do you think this sentence means?

Based on the map guide data, I made a sensible mountain climbing plan.

Why it means that

Based on evidence or rules

～に基もとづいて means “based on.” It says that an action, decision, or statement uses evidence, rules, facts, or data as its foundation.

Examples

この映画えいがは本当ほんとうの話はなしに基もとづいています。

kono eiga wa hontou no hanashi ni motozuite imasu.

This movie is based on a true story.

先生せんせいは学校がっこうの規則きそくに基もとづいて、判断はんだんします。

sensei wa gakkou no kisoku ni motozuite, handan shimasu.

The teachers make decisions based on the school rules.

How it is built

Use noun + に基もとづいて before a verb or clause. Use noun + に基もとづく directly before another noun, as in 事実じじつに基もとづく報告ほうこく (“a report based on facts”).

basis noun+に基づいて+action or result／basis noun+に基づく+noun

Example

法律ほうりつに基もとづく判断はんだんが必要ひつようです。

houritsu ni motozuku handan ga hitsuyou desu.

A judgment based on the law is necessary.

Examples

昔むかしの写真しゃしんに基もとづいて、焼やけたお城しろが元もとと同おなじ形かたちに建たて直なおされた。

mukashi no shashin ni motozuite, yaketa oshiro ga moto to onaji katachi ni tatenaosareta.

Based on old photographs, the burned castle was rebuilt in the same form as before.

医者いしゃは、検査けんさのデータに基もとづいて薬くすりの量りょうを決きめた。

isha wa, kensa no deeta ni motozuite kusuri no ryou o kimeta.

The doctor decided the dose of the medicine based on the test data.

経験けいけんに基もとづくアドバイスは、とても役やくに立たつ。

keiken ni motozuku adobaisu wa, totemo yaku ni tatsu.

Advice based on experience is very useful.

7 more examples in the grammar path — free for a limited time.