Can the word infrastructure be in plural form?

While "infrastructure" is often used as a singular noun, it *can* be used in the plural form, "infrastructures".

Here's when it makes sense to use "infrastructures":

* When referring to multiple distinct systems or networks: For example, "The city has separate infrastructures for transportation, communication, and energy."

* When emphasizing the diversity or complexity of infrastructure: "The country's various infrastructures are in need of modernization."

However, it's generally more common to use the singular form "infrastructure" even when discussing multiple elements:

* "The infrastructure of the city needs improvement." (Even if this refers to roads, bridges, water systems, etc.)

In essence, using "infrastructures" is more precise and emphasizes the distinctness of the systems, while using "infrastructure" is more general and encompasses all elements as a whole.