Question

When I went to the shop
they ............ (sell) toy I wanted
(Past Perfect​)

Answer 1

Answer:

was selling is answer of your question

Answer 2

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When I went to the shop

they had sold the toy.

Correct sentence:

They had sold the toy before I went to the shop.

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Past Perfect Tense:

There are two types of complete actions mentioned in this tense. One had been done before the second action started (happened).First action follows the past perfect tense and the second action follows the past infinite tense.

First action(past perfect tense).

Second action (past indifinite).

Formation: After the subject,helping verb only had put up and the main verb will be changed into past participle form(V3)

Structure: S+ helping verb(had) + V3+O.

Example:

•The teacher had entered into the class before we reached to school.

•The patient had died before the doctor came.

•My sister had gone to Kolkata before I went.