| enquire /ɪnˈkwaɪə/ | formal for ask | I am writing to enquire about the summer course. (ask) |
| ascertain /ˌæsəˈteɪn/ | formal for find out | Police are trying to ascertain how the fire started. (find out) |
| utilise /ˈjuːtəlaɪz/ | formal for use | The school will utilise the old gym as a theatre. (use) |
| deem /diːm/ | formal for consider / judge | The water was deemed unsafe to drink. (considered) |
| substantial /səbˈstænʃl/ | formal for big / large | She won a substantial amount of money. (big) |
| detrimental /ˌdetrɪˈmentl/ | formal for harmful / bad | Too much screen time can be detrimental to sleep. (bad) |
| reside /rɪˈzaɪd/ | formal for live | The author currently resides in Lisbon. (lives) |
| inform /ɪnˈfɔːm/ | formal for tell | Please inform us if you cannot attend. (tell) |
| numerous /ˈnjuːmərəs/ | formal for lots of / many | The band has won numerous awards. (many) |
| request /rɪˈkwest/ | formal for ask for | Guests may request a late check-out. (ask for) |