Explanation

The correct verb tenses to use are "was stolen" and "was offered".

This indicates that the bike was stolen (past event) and the reward was offered (past event) to recover it.

"My bike which was stolen was brought back only when a 20-pound-reward was offered."

میری موٹرسائیکل جو چوری کی گئی تھی اسے صرف اس وقت واپس لایا گیا جب 20 پاؤنڈ کا بدلہ پیش کیا گیا تھا۔

Explanation

It was raining yesterday, so we did not go out.

We use Past Indefinite Tense/Past Simple Tense with Yesterday.

Formula of Negative sentence of Past Indefinite Tense:

Subject + did + not + first form of a verb + object.

Explanation

We use Present Perfect Tense for actions we have done once in our lives.

Examples: 

It's the first time I have visited Karachi. 

It's the first time I have eaten sea-food in my life.

It's the first time she has won the match.

Explanation

Explanation

"We use 'will purchase' to express your intent to buy something in the future if you have the money."

 The modal verb 'will' is used to express future tense,

while 'purchase' is the base form of the verb used to describe the action of buying something.