A lot/many
Mucho + (verb) [no change]
Mucho/a + thing [singular]
Muchos/as + things [plural]
A little/few
Poco + (verb) [no change]
Poco/a + thing [singular]
Pocos/as + things [plural]
Well/very/fine
Bien
Badly/poorly
Mal + verb conjugated
Mal ejemplo