But the lady said she just(to remember) something You (to suppose ) to know such

But the lady said she had just remembered something. You supposed to know such things.

Но леди сказала, что она только что вспомнила кое-что. Ты должен знать такие вещи.

These sentences are in past. The first part of the first sentence is in Past Indefinite (said). The second part of the first sentence is in Past Perfect. The keyword of Perfect is just. Past Perfect is formed with the past form of the auxiliary verb to have — had. We use the third form of verb. To remember is a regular verb. That's why we add the suffix – ed to verb.