The grass are so nice/the grass is so nice?
Ok, that is obvious 'is'. But what about: "Nice grass! They are so cute?" OR "Nice grass! It is so cute?"
Both seems a bit off. Let's just say I NEED to comment that they are cute/it is cute. Which one is correct?

I heard that grass kind of singular, like fish. But should I grass 'they' or 'it'? Normally I'd use 'is'...but it seems strange to call a lawn of grass 'it'.

Thank you!

Question

The grass are so nice/the grass is so nice?
Ok, that is obvious 'is'. But what about: "Nice grass! They are so cute?" OR "Nice grass! It is so cute?" 
Both seems a bit off. Let's just say I NEED to comment that they are cute/it is cute. Which one is correct?

I heard that grass kind of singular, like fish. But should I grass 'they' or 'it'? Normally I'd use 'is'...but it seems strange to call a lawn of grass 'it'.

Thank you!

Answer

Grass is uncountable, so you treat it as "it".

"Nice grass! It's so cute!" (I've never heard of anyone calling grass "cute", by the way.)

Correction: "Both seem a bit off." (Both = 2 = they.)  You can, however, use "each one" if you want to use the 3rd person "seems": "Each one seems a bit off."

Also, "fish" can be singular, plural or uncountable depending on the context. It's probably not the best example to use here.

Answer

"It is so cute". Usually when describing an inanimate object, you use it.

Answer

Here , grass is a noun.
It's plural form is :Grasses
Fresh, soft, fluffy, (if wet) bright and so forth for grass or grasses.