английский 1. - He dances very well. classes. 2. I was waiting for him but he (not come). 3. Hurry up! The train just (arrive). 4. I (not read) the book yet. 5. Your friends already (leave). 6. They (leave) five minutes ago. 7. I (do) six exercises today. 8. How long .. you (be) here? 9. .. you (wait) for me yesterday? 10. It (rain) yesterday. 11. Look! He (break) his car! 12. We (get acquainted) five years ago. 13. I (call) your uncle just now. 14. They (not book) the hotel yet. 15. Nick (write) me a message thirty minutes ago. Yes, he does. He (attend) dancing .​

Sure, I'll be happy to help you with your English exercise!

1. "He dances very well" - This sentence is in the present tense and describes someone's ability to dance. The verb "dances" agrees with the third-person singular subject "he." It means that he is currently good at dancing.

2. "I was waiting for him but he (not come)" - This sentence is in the past tense. The phrase "but he (not come)" suggests that something did not happen. In this case, it means that he did not come. The verb "did not come" is the negative form of the past tense of the verb "come."

3. "Hurry up! The train just (arrive)" - This sentence is in the present perfect tense. The phrase "The train just (arrive)" means that the train has recently arrived. The verb "arrive" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

4. "I (not read) the book yet" - This sentence is in the present perfect tense. The phrase "I (not read) the book yet" means that I have not read the book up until now. The verb "not read" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

5. "Your friends already (leave)" - This sentence is in the present perfect tense. The phrase "Your friends already (leave)" means that your friends have already left. The verb "leave" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

6. "They (leave) five minutes ago" - This sentence is in the past tense. The phrase "They (leave) five minutes ago" means that they left five minutes before now. The verb "leave" is used in its base form because it describes a past action.

7. "I (do) six exercises today" - This sentence is in the past tense. The phrase "I (do) six exercises today" means that I did six exercises earlier today. The verb "do" is used in its base form because it describes a past action.

8. "How long .. you (be) here?" - This sentence is asking about the duration of time. The phrase "How long .. you (be) here?" means "How long have you been here?" The verb "have been" is used in the present perfect tense to describe the length of time the person has been in that place.

9. ".. you (wait) for me yesterday?" - This sentence is in the past tense and asks about an action in the past. The phrase ".. you (wait) for me yesterday?" means "Were you waiting for me yesterday?" The verb "wait" is used in its base form because it describes a past action.

10. "It (rain) yesterday" - This sentence is in the past tense and describes the weather. The phrase "It (rain) yesterday" means that it rained yesterday. The verb "rain" is used in its base form because it describes a past action.

11. "Look! He (break) his car!" - This sentence is in the present tense and describes an action happening right now. The phrase "He (break) his car" means that he is currently breaking his car. The verb "break" is used in its base form because it describes a present action.

12. "We (get acquainted) five years ago" - This sentence is in the past tense. The phrase "We (get acquainted) five years ago" means that we became acquainted with each other five years ago. The verb "get acquainted" is used in its base form because it describes a past action.

13. "I (call) your uncle just now" - This sentence is in the past tense and describes an action that happened very recently. The phrase "I (call) your uncle just now" means that I called your uncle a very short time ago. The verb "call" is used in its base form because it describes a past action.

14. "They (not book) the hotel yet" - This sentence is in the present perfect tense. The phrase "They (not book) the hotel yet" means that they have not booked the hotel up until now. The verb "book" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

15. "Nick (write) me a message thirty minutes ago" - This sentence is in the past tense and describes an action that happened thirty minutes ago. The phrase "Nick (write) me a message thirty minutes ago" means that Nick sent me a message thirty minutes in the past. The verb "write" is used in its base form because it describes a past action.

Yes, he does. He (attend) dancing classes. - This sentence is in the present tense. The phrase "Yes, he does. He (attend) dancing classes" means that he does attend dancing classes. The verb "attend" is used in its base form because it describes a present action.

I hope this helps clarify the usage of verb tenses in the given sentences. Let me know if you have any further questions!