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Common Mistakes and Confusing Words in English
To assume is a regular verb that means to suppose something to be true, but without proof.
I assume you're here to learn English.
To know is an irregular verb that means to be absolutely certain or sure about something, usually through observation, inquiry, or information.
You know you should practise English every day, but you never seem to have the time.
To think is an irregular verb that means to have a particular opinion, belief, or idea about someone or something.
I think English is a global language.
!Note - If you need to remember which one to use, memorise this sentence:-
Why do some people assume they know what other people think about something?