4. заполните пропуски соответствующей формой глагола to be, to have. 1. this boy … my brother. 2. … this their office? 3. there … a lot of toys under the table. 4. there … two chairs and a table in his study. 5. when do you usually … dinner. 6. she … a lot of work to do last week.

1. This boy is  my brother.
2. Is this their office?
3. There are a lot of toys under the table.
4. There are two chairs and a table in his study.
5. When do you usually have dinner.
6. She had a lot of work to do last week.

1) is
2) Is
3) are
4) are 
5)have
6) had

"Привет!

По вашему запросу, вам нужно заполнить пропуски соответствующей формой глагола "to be" или "to have". Давайте приступим к решению по шагам:

1. this boy … my brother.
В данном предложении мы говорим о принадлежности, поэтому используем глагол "to be" в его форме "is". Значит, правильный ответ: this boy is my brother.

2. … this their office?
В этом предложении мы спрашиваем о принадлежности, поэтому также используем глагол "to be" в форме "is". Кроме того, у нас есть указательное местоимение "this", которое указывает на единственное число. Значит, правильный ответ: is this their office?

3. there … a lot of toys under the table.
В данном случае, поскольку мы говорим о наличии (множественное число), мы используем глагол "to be" в форме "are". Правильный ответ: there are a lot of toys under the table.

4. there … two chairs and a table in his study.
Здесь мы также говорим о наличии, но имеем дело с единственным числом, поэтому глагол "to be" будет в форме "is". Правильный ответ: there is two chairs and a table in his study.

5. when do you usually … dinner.
В этом предложении мы спрашиваем о привычке, т.е. используем глагол "to have" в форме "have". Правильный ответ: when do you usually have dinner.

6. she … a lot of work to do last week.
Здесь мы говорим о наличии работы, поэтому используем глагол "to have" в форме "has". Правильный ответ: she has a lot of work to do last week.

Надеюсь, что мое пояснение помогло вам понять использование глаголов "to be" и "to have" в предложениях. Если у вас есть еще вопросы или нужна дополнительная помощь, пожалуйста, сообщите мне!"

(Translation in English)

"Hi there!

According to your request, you need to fill in the blanks with the appropriate form of the verbs "to be" or "to have". Let's walk through the solution step by step:

1. this boy … my brother.
In this sentence, we are talking about possession, so we use the verb "to be" in its form "is". Therefore, the correct answer is: this boy is my brother.

2. … this their office?
In this sentence, we are asking about possession, so we also use the verb "to be" in the form "is". Additionally, we have the demonstrative pronoun "this" indicating singular form. Hence, the correct answer is: is this their office?

3. there … a lot of toys under the table.
Here, since we are talking about existence (plural form), we use the verb "to be" in the form "are". The correct answer is: there are a lot of toys under the table.

4. there … two chairs and a table in his study.
In this case, we are also talking about existence, but we have a singular form, so the verb "to be" will be in the form "is". The correct answer is: there is two chairs and a table in his study.

5. when do you usually … dinner.
In this sentence, we are asking about a habit, so we use the verb "to have" in the form "have". The correct answer is: when do you usually have dinner.

6. she … a lot of work to do last week.
Here, we are talking about having work, so we use the verb "to have" in the form "has". The correct answer is: she has a lot of work to do last week.

I hope my explanation helped you understand the usage of the verbs "to be" and "to have" in sentences. If you have any further questions or need additional assistance, please let me know!"