At a glance
そういえば means "speaking of which", "that reminds me" or "come to think of it". You use it when something just said or seen makes you remember something related.
A。そういえば、B。
雨が降ってきたね。そういえば、傘を持ってきた？ It's started raining. That reminds me, did you bring an umbrella?
How to form it
そういえば does not change form. It goes at the start of sentence B, usually followed by 、.
| Form | Where it goes | Register |
|---|---|---|
| そういえば | Start of B, after A | Neutral; casual and polite speech |
| そう言えば | Start of B, after A | Same meaning, kanji spelling |
| あ、そういえば | Start of B | Suddenly remembering something |
| そういや | Start of B | Casual speech only |