To complete the sentences with the correct form of the verb "be" using short forms, we need to carefully consider the subjects and ensure that the verb agrees with them in both number and person. Here's the complete and correct version of each sentence:
We aren't from Russia.
- Here, "We" is the subject, which is plural. The correct form of "be" for "we" is "are," and in the negative short form, it becomes "aren't."
I'm 13 years old.
- "I" is the subject, which is singular. The correct form of "be" for "I" is "am," and in the short form, it is "I'm."
Igor Akinfeev isn't from France.
- "Igor Akinfeev" is a singular subject. The correct form of "be" here is "is," and in the negative short form, it becomes "isn't."
Pizzas aren't Chinese.
- "Pizzas" is a plural subject. The correct form of "be" for a plural subject is "are," and in the negative short form, it is "aren't."
It's a blue flag.
- "It" is a singular subject. The correct form of "be" for "it" is "is," and in the short form, it is "it's."
I'm bilingual.
- Again, "I" is the singular subject. The correct form of "be" for "I" is "am," and in the short form, it is "I'm."
In summary, when filling in the blanks with the correct form of "be" in its short form, we consider the subject of each sentence and ensure that the verb agrees in both number and person. This process involves understanding which form of "be" (am, is, are) fits with each subject and using the appropriate short form for each context.