always 

routinely    (customarily)

as a rule

in general

normally

usually

We always take the garbage out at night.

We routinely take the garbage out at night.

As a rule, we take the garbage out at night.

In general, we take the garbage out at night. (There are few exceptions.)

We normally take the garbage out at night.  (Unless something unexpected prevents this.)

We usually take the garbage out at night.  (Sometimes we're too tired.)

most of the time

often

frequently

half of the time

Most of the time, we take the garbage out at night.  (Sometimes we forget to.)

We often take out the recyclables.  recyclables (N) – bottles, plastics, paper

We frequently take out the recyclables. (We take it out when the container is full.) 

Half of the time, we take out the recyclables.

sometimes

occasionally

on occasion

rarely

seldom

hardly ever

We sometimes take batteries out. 

We occasionally take batteries out. 

On occasion, we take batteries out. 

We rarely take batteries out. (We don't use many batteries.)

We seldom take batteries out. 

We hardly ever take batteries out.  (Use ever after a negative word.)

never

not ever

We never take hazardous waste out.  (We use them up and then recycle the containers.)

We don't ever take hazardous waste out.  (Use ever after a negative word.)