Read the following sentences from the text. Analyse the usage of 'could' and match the sentences with their functions given in the box below. Functions: Past ability or purpose | Possibility | Past possibility or speculation | Unreal or hypothetical situation
It could be in any field—sports, science, arts, business or design.
Possibility
"I wish I could be this or the other," they have never got beyond just wishful thinking.
Unreal or hypothetical situation
They could have preferred to trade their dream for security.
Past possibility or speculation
I know too, of people who had wished to finish secondary school but they had to go out to work so that they could support their siblings through school.
Past ability or purpose
Explanation
In sentence 1, 'could' refers to something that is possible in the present or future, matching the function of Possibility. In sentence 2, 'could' follows the word 'wish', indicating something imagined but not real, which matches the function of an Unreal or hypothetical situation. In sentence 3, 'could have' is used to guess or speculate about something that might have happened in the past, matching Past possibility or speculation. In sentence 4, 'could' is used with 'so that' to show the purpose or ability of an action in the past, matching Past ability or purpose.