1. AUXILIARY VERBS Tenses revision NH Intermediate, WB p.5 ex.1

2. Present Simple I like skiing. I don’t like snowboarding. Do you like skiing? My father likes skiing. My mother doesn’t like skiing. Does your father like skiing? => auxiliary ‘to do’ + infinitive in negative sentences and questions

3. Present Continuous I’m studying English. I’m not studying Spanish. Are you studying English? My father’s studying English. My mother isn’t studying English. Is your father studying English? => auxiliary ‘to be’ + ing-form

4. Past Simple I saw the Empire State Building. I didn’t see the Statue of Liberty. Did you see the Empire State Building? My father saw the Empire State Building. My mother didn’t see the Empire State Building. Did your father see the Empire State Building? => auxiliary ‘to do’ + infinitive in negative sentences and questions

5. Present Perfect I’ve met Muhammad Ali. I haven’t met Pelé. Have you met Muhammad Ali? My father has met Muhammad Ali. My mother hasn’t met Muhammad Ali. Has your father met Muhammad Ali? => auxiliary ‘to have’ + past participle