1. "Did someone ring you an hour ago?" Martin said to Susan → Martin asked Susan 2. You can't travel on this train if you don't have a reservation. → Unless 3. The exam question was so easy that we all got it right. → It was such 4. Today isn't Sunday, that's why the pupils can't go to swimming. → If

1. "Did someone ring you an hour ago?" Martin said to Susan

→ Martin asked Susan  if someone had rung her an hour before.

2.You can't travel on this train if you don't have a reservation.

→ Unless you have a reservation, You can't travel on this train

3. The exam question was so easy that we all got it right. 

> It was such an easy the exam question that we all got it right

4.    Today isn't Sunday, that's why the pupils can't go to swimming.

→ If today is Sunday, the pupils could go swimming.

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