If you use ‘when’ in the irst part of the sentence, use a comma before the second part. Have a look at the following examples.

1. When a team of scientists from Texas University sailed in the ocean near Costa Rica, they helped an injured sea turtle.

2. When Melati and Isabel decided to tackle plastic pollution, they were only 12 and 10 years old.

Can you do the same with examples numbers 3 and 4?

3. ____________________________ , ______________________________.

4. ____________________________ , ______________________________.

b. Sequence the following sets of series of events with ‘when’. Use

‘when’ both in the irst part and the second part of the sentences.

1. Melati and Isabel went hiking to Mount Batur with their parents.

They saw some plastic bottles and bags along the way.

Melati and Isabel saw some plastic bottles and bags when

____________________.

When Melati and Isabel went hiking to Mount Batur with their parents, ______________________________.

2. A team of scientists sailed in the ocean near Costa Rica. They saw an injured sea turtle.

_______________________________ when _____________________________.