1. If we plant more trees, the air will be fresher.

2. My sister like football match but she never has time to watch it.

3. If we cycle to school every day, we will keep fitter.

4. Although the newsreader speaks really fast, my father can hear everything.

5. He liked his dog because he was intelligent.

1. We will plant more trees. The air will be fresher. (if)

=>If we plant more trees, the air will be fresher.

2. My sister like football match but She never has time to watch it.(but)

=>My sister like football match but she never has time to watch it.

3. We will cycle to school every day. We will keep fitter. (if)

=>If we cycle to school every day, we will keep fitter.

4. The newsreader speaks really fast. My father can hear everything.(althought)

=>Although the newsreader speaks really fast, my father can hear everything.

5. He liked his dog. He was intelligent.(because)

=>He liked his dog because he was intelligent.