Select the option that expresses the given sentence in simple past tense.
A. Arun knew the concepts of geometry.
B. Arun had been knowing the concepts of geometry.
C. Arun had known the concepts of geometry.
D. Arun was knowing the concepts of geometry.

Correct option is A

Option (a) Arun knew the concepts of geometry expresses the sentence in the correct simple past tense.
Explanation:
The simple past tense is used to describe a completed action or a state in the past without focus on duration. "Knew" is the past tense of "know", and it appropriately expresses a general fact or state in the past.
Grammatical Rule Used:
Simple past tense structure:
Subject + V2 (past form of verb) + object
Example: She read the book yesterday.
Why other options are incorrect:
· B. had been knowing – incorrect: “Know” is a stative verb and does not take continuous form.
· C. had known – past perfect, used only when referring to an action completed before another past action.
· D. was knowing – incorrect: "Know" should not be used in continuous tense.
Information Booster:
Stative verbs like know, believe, own, like, etc., are generally not used in continuous forms.