Используйте past simple или present perfect. 1 . yesterday they a party. (have) 2. last week wee composition. (write) 3. to boston yet. ( not be) 4.the pupils the new rule last monday. (not) 5. kate and jess a nice cat recenrly.( buy) 6. two days ago my friend and i an ufo.(see)

1 . Yesterday they had a party. 
2. Last week we wrote a composition. 
3. I have not been  to Boston yet. 
4.The pupils did not understand the new rule last Monday. 
5. Kate and Jess have bought a nice cat recenrly.
6. Two days ago my friend and I saw an UFO.