Learn Farsi: همه‌ی استانداردهای بهداشتی مهم هستند. - All of the sanitary standards are important.

همه (all) uses the Ezafe to connect to a plural noun, meaning 'all of the [plural]'. This lesson contrasts it with هر (each/every), which connects directly to a singular noun without an Ezafe. If you wanted to say 'Every sanitary standard is important,' you would say هر استاندارد بهداشتی مهم است.

Why is there an extra letter ی at the end of همه‌ی?

The word همه ends in a silent heh (ه), which is pronounced as an 'e' sound. Because we need to connect it to the next word using an Ezafe (which is also an 'e' sound), Farsi inserts a 'y' sound to bridge the two vowels. This bridge is written with the letter ی.

How is the adjective بهداشتی formed?

The root word is the noun بهداشت meaning 'health' or 'hygiene'. By adding the suffix ی (an 'i' sound), it turns into the adjective بهداشتی meaning 'health-related' or 'sanitary'.

The subject 'standards' is an inanimate object. Why is the plural verb هستند used here instead of the singular?

You might remember that inanimate plural subjects in Farsi usually take a singular verb. However, using the plural verb هستند is also completely correct. It is often used in formal writing, or when the speaker wants to emphasize that the items are distinct, individual things.