1.1. The girl says:" I am buying a present for my mum." 2. Mfr. Johnson says :" I usually use the net to chat with my coworkers."3. The correspondent says:" My friend has been to this place before" 4. The students say: " Our teacher very strict." 5. Dad says :" We will go to Europe in summer." 6. The man says :" My wife knew about it yesterday." 7. Mum Says:"

При изменении прямой речи в косвенную местоимения первого и второго лица заменяются местоимениями третьего лица и соответственно меняются формы глаголов.

1. The girl says:" I am buying a present for my mum."

  The girl says that she is buying a present for her mum.

2. Mr. Johnson says :" I usually use the net to chat with my coworkers."

   Mr. Johnson says (that) he usually uses the net to chat with his coworkers.

3. The correspondent says:" My friend has been to this place before"

   The correspondent says his friend has been to this place before.

4. The students say: " Our teacher is very strict."

   The students say their teacher is very strict.

5. Dad says :" We will go to Europe in summer."

  Dad says we will go to Europe in summer.

Поскольку слово dad написано без артикля, говорящий говорит о своем отце, поэтому местоимение we относится ко всей семье говорящего, а значит, местоимение не меняется.

6. The man says :" My wife knew about it yesterday."

   The man says his wife knew about it yesterday.

7. Mum says:" I am very tired today."

  Mum says she is very tired today.