Use simple present with adverbs of frequency to talk about things that are true in general, or things you do as habits and routines.
Adverbs of frequency
0%------------------------------------------50%-------------100%
never- hardly ever - rarely - occasionaly sometimes -usually-always
Other adverbs:
seldom = rarely ----- often / generally = usually
Position of adverbs of frequency:
In general they go between the subject and the verb
- They always come to class
- He hardly ever asks questions in class.
- Mary never has milk for breakfast (* el verbo has puede ser para comer o tomar)
With the verb to be place the adverb after the verb
- Mary is rarely late for classes.
- I am usually sad when I argue with my wife.
*Sometimes, often and frequently may go at the beginning of the sentences. (*estos pueden ir al comienzo de las oraciones)
- Sometimes I go to eat at McDonalds.