1. What am I doing now? 2. How long have I been doing my homework? 3. What have I already done since I am free now?

Present continuous tense and present perfect continuous tense:

Разъяснение:
1. "What am I doing now?"
The present continuous tense is used to describe an action happening at the present moment. It is formed by using the auxiliary verb "am" (for first person singular) or "is/are" (for third person singular or plural) and adding the present participle (-ing form) of the main verb. In this case, "am" is used with the pronoun "I" to indicate that the speaker is performing the action in the present moment.

2. "How long have I been doing my homework?"
The present perfect continuous tense is used to describe an action that started in the past, is still continuing in the present, and is expected to continue in the future. It is formed by using the auxiliary verb "have/has been" and adding the present participle (-ing form) of the main verb. In this case, "have been" is used with the pronoun "I" to indicate that the speaker started doing their homework in the past and is still doing it in the present.

3. "What have I already done since I am free now?"
The present perfect tense is used to describe an action that happened at an unspecified time before the present moment. It is formed by using the auxiliary verb "have/has" and adding the past participle of the main verb. In this case, "have" is used with the pronoun "I" to indicate that the speaker has completed some tasks or activities since becoming free.

4. "What are the children doing now?"
The present continuous tense is used to describe an action happening at the present moment. In this case, the verb form "are doing" is used with the plural subject "the children" to indicate that the children are performing the action in the present moment.

5. "Since when have the children been planting the flowers?"
The present perfect continuous tense is used to describe an action that started in the past, is still continuing in the present, and is expected to continue in the future. In this case, "have been planting" is used to indicate that the children started planting the flowers in the past and are still planting them in the present.

6. "What have I been doing recently?"
The present perfect continuous tense is used to describe an action that started in the past, is still continuing in the present, and is expected to continue in the future. In this case, "have been doing" is used with the pronoun "I" to indicate that the speaker started doing something in the past and is still doing it in the present.

7. "What are we doing now?"
The present continuous tense is used to describe an action happening at the present moment. In this case, the verb form "are doing" is used with the plural subject "we" to indicate that the speaker and the listener(s) are performing the action in the present moment.

8. "What have we been doing lately that makes us happy?"
The present perfect continuous tense is used to describe an action that started in the past, is still continuing in the present, and is expected to continue in the future. In this case, "have been doing" is used with the pronoun "we" to indicate that the speakers have been doing something lately and it brings them happiness.

9. "How long have we been doing the project that makes us tired?"
The present perfect continuous tense is used to describe an action that started in the past, is still continuing in the present, and is expected to continue in the future. In this case, "have been doing" is used with the pronoun "we" to indicate that the speakers have been working on a project that makes them tired for a certain period of time.

10. "What has my friend been doing since childhood?"
The present perfect continuous tense is used to describe an action that started in the past, is still continuing in the present, and is expected to continue in the future. In this case, "has been doing" is used to indicate that the speaker"s friend has been performing some activities or tasks since childhood.

11. "How many poems has my friend already written?"
The present perfect tense is used to describe an action that happened at an unspecified time before the present moment. In this case, "has written" is used to indicate that the speaker"s friend has completed a certain number of poems in their lifetime.

Examples of use:
1. "Я сейчас готовлю уроки." (What am I doing now?)
2. "Сколько времени я уже делаю домашнюю работу?" (How long have I been doing my homework?)
3. "Что я уже успел сделать с тех пор, как я свободен?" (What have I already done since I am free now?)
4. "Что дети сейчас делают?" (What are the children doing now?)
5. "С какого времени дети занимаются посадкой цветов?" (Since when have the children been planting the flowers?)
6. "Что я недавно делал?" (What have I been doing recently?)
7. "Что мы сейчас делаем?" (What are we doing now?)
8. "Что мы недавно делали, что заставляет нас счастливыми?" (What have we been doing lately that makes us happy?)
9. "Как давно мы занимаемся проектом, что утомляет нас?" (How long have we been doing the project that makes us tired?)
10. "Что мой друг делает с детства?" (What has my friend been doing since childhood?)
11. "Сколько стихов уже написал мой друг?" (How many poems has my friend already written?)

Совет:
Чтобы лучше понять использование настоящего продолженного времени и настоящего совершенного продолженного времени, было бы полезно провести время на чтение или просмотре текстов или видео, где эти грамматические конструкции используются. Постарайтесь обратить внимание на контекст и время, чтобы правильно определить, какая форма глагола подходит в каждой ситуации. Попробуйте составить свои собственные предложения, используя эти времена, чтобы закрепить свое понимание и научиться применять их в речи.

Задача для проверки:
Переведите следующие предложения на русский язык, используя правильное время.

1. What am I doing at the moment?
2. How long have I been studying English?
3. What have I already read since I started this book?
4. What are the students doing in the classroom?
5. Since when have the students been learning French?
6. What have I been working on lately?
7. What are we eating for dinner?
8. What have we been watching on TV?
9. How long have we been waiting for the bus?
10. What has my sister been singing since she was a child?
11. How many books has my brother already written?