grass
The Spanish word 'pasto' means 'grass' in English. It refers to general grasses or lawns; the green vegetation growing in your backyard or in parks. It includes the plants that cover the ground in fields and pastures, and is food for many herbivorous animals. 'Pasto' can also be used to refer to fodder, the food that is given to domesticated animals like cows and horses.
The grass in this park is very green.
This example explains an observation about the color of the grass in a park. In Spanish, 'pasto' translates to 'grass'.
The horses are eating grass in the field.
This sentence talks about horses in a field, eating grass. Here, 'pasto' is again used to mean 'grass', this time indicating what the horses are consuming.
I have to water the grass in the garden.
This statement is talking about a person's obligation or action toward taking care of the garden, specifically, watering the grass. Here, 'pasto' is used to refer to 'grass' in the garden that needs watering.