He is so weak to lift the box.
Grammar Rule: Correcting 'So... To' Structure
The sentence "He is so weak to lift the box" uses an incorrect structure. The standard and grammatically correct way to express a degree of adjective leading to a consequence is the $so... that...$ structure.
The $so... that...$ Construction
- Structure: $Subject + verb + so + adjective + that + subject + modal verb (can't/couldn't) + verb...$
- Usage: This structure indicates that the degree of the adjective (weak) results in the inability to perform the action (lift the box).
Applying the Rule
In this sentence:
- The adjective is $weak$.
- The consequence of being weak is the inability to lift the box.
- Therefore, the correct structure is: "He is so weak that he cannot lift the box."
This matches Option A.
Why Other Options Are Incorrect
- Option B uses 'and', which is a coordinating conjunction and doesn't fit the cause-and-effect relationship required here. It also incorrectly states he *does* lift the box.
- Option C uses the correct 'so... that...' structure but implies his weakness enables him to lift the box, which is illogical.
- Option D uses 'could', which might imply past inability or a hypothetical situation, whereas 'cannot' clearly expresses present inability, fitting the context better.
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