Обусловьте видовременную форму глагола (Past Simple, Past Continuous, Past Perfect) и

Обусловьте видовременную форму глагола (Past Simple, Past Continuous, Past Perfect) и выполните перевод.

1. As we know, transistors replaced electronic tubes due to their numerous advantages.
2. She had never worked with database until I taught her.
3. The computer was loading when I came in.
4. They were performing all instructions yesterday morning.
5. Sorry, but I deleted your files two days ago.