USING “A” OR “AN”
| a + a word beginning with | a = | an ambulance |
| e = | an emergency | |
| i = | an identification card | |
| o = | an office | |
| u = | an unknown child |
| a + a word beginning with all other letters | = | a bus stop |
| = | a car | |
| = | a father | |
| = | a man | |
| = | a wife | |
| = | a Phone |
| In the office: | an office | a large office |
| At the emergency: | an emergency | a medical emergency |
| With the ambulance: | an ambulance | a licensed ambulance |
| The card: | a card | an identification card |
| The number: | a number | an insurance number |
| The day at work: | a work day | an emergency work day |