Japanese grammar

What does ~としたら mean? Japanese grammar N2

~としたら means supposing that…, then.

Quick facts
Level (estimated, JLPT framework)N2
StructurePlain form + としたら
N/な形 + だ + としたら
Romajitoshitara
Meaningsupposing that…, then

Forming it

Noun本当 → 本当だとしたら
Verb降る → 雨が降るとしたら

How to use it

Sets up a hypothesis and discusses its consequence. Used for something that hasn't happened or is contrary to fact.

  • 「~としたら」 = supposing…: 「宝くじが当たったとしたら、何に使いますか」.
  • The second clause is usually a question or an inference, rarely an already-established fact.
  • In the same group as 「~とすれば」 (more formal) and 「~とすると」 (leans toward inference). Nouns need 「だ」.

Examples

  • Supposing you won the lottery, what would you spend it on?

  • If this story is true, it will be a serious matter.

Keep in mind

  • Nouns and na-adjectives need 「だ」.
  • Used for a hypothesis, not for something certain.

Common mistakes

  • Wrong本当(ほんとう)としたら、大変(たいへん)だ。

    Supposing that were true, it would be a big problem.

    Correct本当(ほんとう)だとしたら、大変(たいへん)だ。

    Nouns and na-adjectives need 「だ」.

  • Wrong明日(あした)は日曜日(にちようび)だとしたら、休(やす)みです。

    Since tomorrow is Sunday, it's a day off.

    Correct明日(あした)は日曜日(にちようび)だから、休(やす)みです。

    For something certain, a hypothesis is not used.

Exam tips

  • 「としたら」 = supposing…; nouns/na-adjectives need 「だ」.

Related patterns

All N2 grammar →