3. Write negative sentences: 1) My mother always cooks Haggis for dinner. 2) I climb the fence on my way home. 3) Water boils at 200°C. 4) My sister comes home at night. 5) We have parties every day. 6) My friend studies on Sunday. 7) My granny can speak Chinese and Japanese. 8) My brother plays music. 9) Most elderly people go jogging. 10) Animals brush their teeth every morning.

1. My mother does not always cook Haggis for dinner.
2. I do not climb the fence on my way home.
3. Water does not boil at 200°C.
4. My sister does not come home at night.
5. We do not have parties every day.
6. My friend does not study on Sunday.
7. My granny cannot speak Chinese and Japanese.
8. My brother does not play music.
9. Most elderly people do not go jogging.
10. Animals do not brush their teeth every morning.

В отрицаниях Present Simple используются do not/does not, после них ставится начальная форма глагола. С модальным глаголом can используется форма cannot.