Question

Когда пишется are ,а когда is?

Answer 1

Are пишется после сущ, во множественном числе. 
is пишется после сущ в единственном числе
примеры: We are pilots (мы пилоты-мн. число)
He is a pupil (он ученик-ед ч)
Эти глаголы ставятся в 2 случаях:
1) Действие происходит сейчас
2) В предложении нет сказуемого

Answer 2

Are: we, you, they
Is: she,he,it

Answer 3

When to Use "are" and "is"

In English, "are" and "is" are forms of the verb "to be" and are used in different contexts.

"Are" is used with plural subjects, such as "you," "we," "they," and any other plural noun or pronoun.

"Is" is used with singular subjects, such as "he," "she," "it," and any other singular noun or pronoun.

For example: - "Are": "You are amazing!" [[4 #]] - "Is": "She is so tall." [[4 #]]

In summary, "are" is used with plural subjects, and "is" is used with singular subjects.