Question

simple past (verb to be)
form:
singular nouns
(+)
i was...
he was...
she was...
it was...
(-)
i was not...
he was not...
she was not...
it was not...
(?)
was i...?
was he...?
was she...?
was it...?
plural nouns
you were...
they were...
we were...
you were not...
they were not...
we were not...
were you...?
were they...?
were we...?
use(s):

• to show an action is finished or completed

time period:
verb + \ed\ or its irregular
i played the guitar
julie sang a lullaby.
completed activity
past present future
key words:
last __ __ ago yesterday today
remember:
example(s):
(+)
(-)
(?)
practice:
(+)
(-)
(?)

Explanation:

The problem is about the Simple Past tense of the verb "to be", which falls under the subfield of Linguistics (a subfield of Arts) as it deals with the structure and usage of language, specifically English grammar.

Answer:

The subfield that best applies is Linguistics (under Arts).