we use the present simple to talk about facts that are always true. we use present simple for permanent situations. we use the present simple for things we do regularly .we can use it with words and phrases describing how often something happens. always,sometimes,often,never,usually,everyday for example 

I go to bed at ten and get up at six every day

we use the present simple with verbs that describe what we feel and think .these verbs are connected with what is in our minds ,not with action.they describe what we like for example like ,dislike,hate,love,what we want like want ,need what we know like know,understand,realize,remember and what we believe like believe,think.we do not use the present continuous with these verbs.for example

i do not understand this letter

not i do not understanding this letters 

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