The suffix -ER can:

1) Indicate the person or object that performs an action.

Examples:

Reader ( the person who reads)
Writer (the person who writes)
Cooker (The object that cooks the food) *** Cooker= fogão; cook= cozinheiro

So, what do you call...
a) a person who teaches?
b) A person who listens?
c) A person who sings?
d) A person who presents something?
e) The object which washes (clothes)?
f) The person who observes?
g) the person who speaks?


2) Form the comparative form for short adjectives.

Examples:
Long= longo longer (than) = mais longo (que)
Hard = difícil harder (than) = mais difícil que


Forme a forma comparativa de:

a) tall
b) short
c) fat *
d) cold
e) warm
f) easy *
g) simple *
h) big *