Replace 'too-----to' with 'so-----that' (past tense)

A.5 Language Study. 2) It was too dark to see who it was. (Choose the alternative showing the correct replacement of 'too-----to').

The structure "too + adjective + to + verb" implies a negative meaning, meaning something is so [adjective] that it cannot [verb]. The correct transformation uses "so + adjective + that + subject + could not + verb" (since the original sentence is in the past tense).

Let's evaluate the options:

• i) It was so dark that they could see who it was. (Incorrect, changes the meaning to positive)
• ii) It was so dark that they could see who it was not. (Incorrect, changes the meaning)
• iii) It was so dark that they could not see who it was. (Correct, maintains the original negative meaning and past tense)
• iv) It was so dark that they could to see who it was. (Incorrect grammar, "could to see" is wrong)

The correct alternative is:

iii) It was so dark that they could not see who it was.