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Coronaviruses (lat. Coronaviridae) is a family of viruses that includes, as of January 2020, 40 species of RNA-containing viruses United in two subfamilies[2] that affect humans and animals. The name is associated with the structure of the virus, whose spiny appendages resemble the solar corona[3]. The purpose of the "crown" in coronaviruses is related to their specific mechanism of penetration through the cell membrane by imitating "fake molecules" of molecules that the transmembrane receptors of cells respond to. After the receptor captures the fake molecule from the "crown", it is pushed by the virus into the cell and the RNA of the virus enters the cell[4][5].

1. With whom did you discuss,
2. I have seen.
3. E entered, I saw, my mother was standing, cutting, she was cooking.
4. I heard, I ran, saw, a child was lying, crying, what has happened, why are you crying, have you hurt.
5. They went.
6. They have been.
7. He came, had, read, began.
8. When did your friend return, she returned, did you go, I didn't, I was.
9. Has your brother returned, he came.
10. Have you been, when were you, I was.
11. Where is your brother, he has just come, he is taking.
12. I saw, I understood, he was working, he was writing, did not notice.
13. I came, the children were running and singing, we have learnt.
14. The young man entered, she looked, what do you want, she said, why have you come.
15. It was raining, I left, I returned, put, started.
16. Are you working, I am preparing.
17. That is, it is, I've just taken.
18. Where did you learn.
19. Have they already thought, have they bought, Mark has just ordered, he has mentioned, he hasn't ordered, he has thought, the shop has charged.
20. Why are you shivering, I am shivering, I am.
21. I have sprained.
22. A world-famous violinist is playing.
23. The children were playing.