Task 10. Read the text and make necessary changes to the verbs. The tenses that are used in the text: Present Simple, Present Continuous, Present Perfect Simple, Past Simple. We i (be) at a party today. Today Nick (have) a birthday. Many guests (already/come) to his party. Everybody (be) happy. Lisa (dance) with Mark. Tina (hold) some drinks and ice-cream. Barbara and Tina (talk) about the party. They (like) the party. They (buy) beautiful dresses for the party yesterday and now they (discuss) the prices for the clothes. Michael (stand) at the table. He (not/eat) anything yet and he (be) hungry. He (get) up three hours ago and he (not/have) time for lunch yet. He (go) to bed very late yesterday. So it (be) difficult for him to get up in the morning. Nick’s parents (go) to visit their friends. They (not come) back yet.
Yesterday all the family (be) very busy. They (do) many things for Nick’s party. Nick’s mother (cook) many tasty things. Nick also (help) her. Nick’s father (not cook) anything because he (be) very busy at work. Nick’s sister Patricia (bake) a nice cake and Nick’s brother (clean) the house.
So today Nick and his friends (celebrate) his birthday. “Many happy returns of the day, Nick!”

Task 10. Read the text and make necessary changes to the verbs. The tenses that are used in the text: Present Simple, Present Continuous, Present Perfect Simple, Past Simple.

We are at a party today. Today Nick is having a birthday. Many guests have already come to his party. Everybody is happy. Lisa is dancing with Mark. Tina is holding some drinks and ice-cream. Barbara and Tina are talking about the party. They like the party. They bought beautiful dresses for the party yesterday and now they are discussing the prices for the clothes. Michael is standing at the table. He has not eaten anything yet and he is hungry. He got up three hours ago and he hasn't had time for lunch yet. He went to bed very late yesterday. So it was difficult for him to get up in the morning. Nick's parents went to visit their friends. They have not come back yet.

Yesterday all the family was very busy. They did many things for Nick's party. Nick's mother cooked many tasty things. Nick also helped her. Nick's father did not cook anything because he was very busy at work. Nick's sister Patricia baked a nice cake and Nick's brother cleaned the house.

So today Nick and his friends are celebrating his birthday. "Many happy returns of the day, Nick!"

Explanation and Step-by-step Solution:
1. We are at a party today. (Present Continuous) - No change needed
2. Today Nick is having a birthday. (Present Continuous) - No change needed
3. Many guests have already come to his party. (Present Perfect Simple) - No change needed
4. Everybody is happy. (Present Simple) - No change needed
5. Lisa is dancing with Mark. (Present Continuous) - No change needed
6. Tina is holding some drinks and ice-cream. (Present Continuous) - No change needed
7. Barbara and Tina are talking about the party. (Present Continuous) - No change needed
8. They like the party. (Present Simple) - No change needed
9. They bought beautiful dresses for the party yesterday and now they are discussing the prices for the clothes. (Past Simple and Present Continuous) - "They bought" changes to "They have bought" to match the Present Perfect Simple tense in the previous sentence. No change needed for "they are discussing."
10. Michael is standing at the table. (Present Continuous) - No change needed
11. He has not eaten anything yet and he is hungry. (Present Perfect Simple and Present Simple) - No change needed
12. He got up three hours ago and he hasn't had time for lunch yet. (Past Simple and Present Perfect Simple) - No change needed
13. He went to bed very late yesterday. (Past Simple) - No change needed
14. So it was difficult for him to get up in the morning. (Past Simple) - No change needed
15. Nick's parents went to visit their friends. (Past Simple) - No change needed
16. They have not come back yet. (Present Perfect Simple) - No change needed
17. Yesterday all the family was very busy. (Past Simple) - No change needed
18. They did many things for Nick's party. (Past Simple) - No change needed
19. Nick's mother cooked many tasty things. (Past Simple) - No change needed
20. Nick also helped her. (Past Simple) - No change needed
21. Nick's father did not cook anything because he was very busy at work. (Past Simple) - No change needed
22. Nick's sister Patricia baked a nice cake and Nick's brother cleaned the house. (Past Simple) - No change needed
23. So today Nick and his friends are celebrating his birthday. (Present Continuous) - No change needed

Note: In the text, the verb forms, tenses, and usage are already correct.