Explanation:
NEED:
1. Desk -- el escritorio -- Necesito un escritorio porque allí es donde guardo mis notas y pruebas. I need a desk because that's where I keep my notes and tests. It's a masculine noun in Spanish language. It carries a meaning of an desk. In this sentence, the noun is used in a singular form, along with the adequate definite article for masculine singular noun, el.
2. Chair -- la silla -- Necesitamos todas las sillas que tenemos aquí porque allí es donde nos sentamos, los niños y yo. We need all the chairs we have in here because that's where children and I sit. It is a feminine noun in Spanish language and it means, a chair. In this sentence, we had this noun in plural form. Along with a noun, we have an adequate definite article for a plural form -- LAS.
3. Blackboard -- la pizarra -- La pizarra es importante para recordar todas las informaciones cruciales. Blackboard is important to remember all the crucial informations. This noun means blackboard, when translated to english. It's a feminine noun in Spanish language and it's accompanied by a definite article for a female, singular form -- LA.
4. Trash can -- el bote de basura -- El bote de basura se usa para tirar todas las cosas sin importancia. Trash can is important to throw away all the unimportant things. This noun consists of two nouns. In english, it's translated as '' trash can ''. It is a masculine noun and it's accompanied by a definite article for singular, masculine form -- EL.
DON'T NEED:
5. Funnel -- el embudo -- Los niños son pequeños para estudiar química, por eso debes quitar el embudo. The children are young to study chemistry, that's why you have to remove the funnel. When translated to english, this noun means a funnel. It's a masculine noun in Spanish language and it's always accompanied by a definite article for masculine, el for singular, los for plural forms.
6. File holder -- la carpeta -- No necesito una carpeta, porque guardo todas las escrituras, pruebas y notas en mi cartera. I don't need a binder, because I carry all the scripts, tests and notes in my bag. It's a feminine noun in Spanish language and it's always accompanied by a definite article, la for singular and las for plural form. It means -- a file holder.
7. Globe -- el globo -- Tenemos un gran mapa y un gran proyector, por eso puedes quitar el globo. We have a huge map and a huge projector, that's why you can remove the globe. This is a masculine noun in Spanish language. In this sentence, it's in singular form and it's accompanied by an adequate masculine article, el. For plural, we would use '' LOS ''.