に言わせれば・に言わせると・に言わせたら

JLPT Level: N1
Meanings

If you ask

In someone else's opinion

According to (a source)

Usage

Nに言わせれば

Nに言わせると

Nに言わせたら

Explanation
This grammar is used to present an opinion or assessment attributed to someone else. It signals that the speaker is citing what a person (or a group) would say if asked, rather than stating the speaker's own view. It often introduces a viewpoint that may differ from the speaker’s own or from common sense, and it can be used to discuss implications or judgments based on that attributed opinion.
専門家に言わせれば、この機械はまだ完成していない。
せんもんかにいわせれば、このきかいはまだかんせいしていない。

According to experts, this machine is not yet finished.

医師に言わせると、早寝早起きが健康の秘訣だそうだ。
いしにいわせると、はやねはやおきがけんこうのひけつだそうだ。

If you ask the doctors, they say that going to bed early and waking up early is key to good health.

あの人に言わせたら、そんな計画は無理だろう。
あのひとにいわせたら、そんなけいかくはむりだろう。

If you ask that person, he would say such a plan is impossible.