1.Modal verbs for caution: "should be cautious" uses the modal verb "should" to express advisability and caution, adding nuance to the argument.
2.Noun phrase as subject: "dependency on external aid" serves as the subject of the sentence, using a complex noun phrase to describe a potential risk, enhancing the depth of the expression.
3.Adjective phrase as a postmodifier: In "sustainable, locally-driven solutions," the adjective phrase "sustainable, locally-driven" functions as a postmodifier to modify "solutions," adding descriptive power and complexity to the sentence.
4.Conditional structure: "might not address the underlying causes of underdevelopment" uses a conditional structure to express uncertainty and potential consequences, demonstrating advanced grammar usage.