but then

• Переходная фраза, используемая для введения контрастного или неожиданного момента, часто указывающая на сдвиг в повествовании или аргументе.

A transitional phrase used to introduce a contrasting or unexpected point, often indicating a shift in a narrative or argument.

1. Contrasting additionB2informal

   Used to introduce a statement that contrasts with or modifies what has just been said.

   Но затем

   • I thought I had finished the work, but then I found another mistake.
   • She seems very confident, but then she might be nervous inside.
   • The plan seemed perfect, but then we realized it was too expensive.

2. Considering a different perspectiveB2informal

   Used to introduce a thought that offers a different or opposite viewpoint.

   С другой стороны

   • He is very strict, but then he is fair.
   • The movie was boring, but then I'm not a fan of that genre.
   • It's a risky investment, but then all investments carry some risk.