Examples:
(a) a roller coaster
(b) a ghost house
(c) a useful tool
(d) a university
Note: University is read as 'Yew-ni-ver-si-ty', thus it starts with a 'yew' sound not a 'u' sound.
(a) an elephant
(b) an unforgettable experience
(c) an orange
(d) an hour
Note: Even though 'hour' starts with the letter 'h', which is a consonant, the word is read as A-WER. The 'h' sound is not pronounced.)
Lions are wild animals.
(Meaning: all lions)
The lions are fed twice a day.
(Specific lions)
Brightly coloured flowers attract butterflies.
(Meaning: all flowers with bright colours attract butterflies)
The flowers in the vase are not real.
(Specific flowers)
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