Technically, "infrastructures" is grammatically correct. It's a plural form of "infrastructure," just like "structures" is the plural of "structure."
However, it's not very common to use "infrastructures" in everyday language. People usually talk about "different infrastructures" or "multiple infrastructure systems" rather than "infrastructures." This is because "infrastructure" often refers to a complex system as a whole, not individual parts.
Here's a breakdown:
* "Infrastructure" as a singular noun: Refers to a system as a whole (e.g., "The country's infrastructure needs improvement.")
* "Infrastructures" as a plural noun: Can be used to refer to multiple, distinct infrastructure systems (e.g., "The city has different infrastructures for transportation, energy, and communication.")
So, while it's grammatically correct to say "infrastructures," it's usually better to use other phrases to avoid sounding awkward.