Sentence substitution is the process of replacing part of a sentence with different words to see how it affects meaning and correctness. For the given exercise, you swap the underlined portion with the alternatives provided ('although,' 'in that,' 'since,' 'as'). Each alternative changes the sentence's meaning slightly. Try replacing each option and re-reading the sentence:
- 'Although' for contrast.
- 'In that' for explaining.
- 'Since' for causation.
- 'As' for comparison or causation.
Determine if the sentence remains grammatically correct and clear. The least acceptable option will make the sentence awkward or change its meaning negatively. This process helps identify the most fitting word and reveals any grammatical issues.