1.3 Change active sentences into passive sentences.
1. I invited my friends to the party.
2. John painted the house last week.
3. Thousands of tourists visit the Grand Canyon every year.
4. Chefs use these machines to mix the ingredients.
1. My friends were invited by me to the party.
2. The house was painted by John last week.
3. The Grand Canyon is visited by thousands of tourists every year.
4. These machines are used by chefs to mix the ingredients.
1.4 Complete the sentences with a gerund or an infinitive.
1. Would you like ... chess with me? (o play)
2. ... TV all evening is boring, let's do something else. (watching)
3. Betty enjoys (skating)
4. Helen promised＿ here on time, but she's late again! (to be)
5. My mother was surprised ＿a present on her bedside table. (to have found)