1.Czasowniki w nawiasach wstaw w poprawnej formie.
1. She (not understand )...................that exercise because it (be)...................... very difficult.
2.They (build)..................a house five years ago because they ( win).........................the lottery.
3. Jack (know)..............................how to do this exercise because it (be)......................easy.
4. My sisters (be)..........................happy when they (meet)............................me.
5. They (not can)..................................... help her because she (not pay)......................them.
6. Elen (drink)................................. all the milk last night because she (be).............................thirsty.​