Identify the correct tense form of the highlighted part in the given sentence.
I learnt Tamil when I was posted in Chennai.

Correct option is A

Correct tense: (a) Simple Past
Explanation (in detail):
• The main verb “learnt” is the past form (V²) of “learn”.
• “was posted” is also in past, indicating the time in the past when learning happened.
• The sentence talks about a completed past action.
Grammatical rule (English):
• Simple Past: Subject + V² (learnt/went/saw)
व्याकरणिक नियम (Hindi):
• Simple Past में क्रिया का दूसरा रूप (V²) आता है और बीती हुई, पूरी हो चुकी क्रिया बताई जाती है।
Meanings of other options (why incorrect):
• (b) Simple Present → V¹ (learn) (structure doesn’t match)
• (c) Past Perfect → had + V³ (had learnt) (not used here)
• (d) Past Perfect Continuous → had been + V-ing (had been learning) (not used here)
Hence, option (a) is the correct answer.