assume vs know vs think

  To assume is a regular verb that means to suppose something to be true, but without proof.

  For example:-

  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.

  For example:-

  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.

  For example:-

  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?

  lay vs lieLay is an irregular transitive verb (lay / laid / laid - laying). It needs a direct object. It means to put something or someone down (often in a horizontal postion).

  For example: "Lay your head on the pillow."

  Lie is an irregular intransitive verb (lie / lay / lain - lying). It does not take a direct object. It means to rest in a horizontal position1 or to be located somewhere2.

  For example: "If you are tired lie here and have a rest."1

  "Nottingham lies in the Midlands."2

  !Lie also means to say something that isn't true but it takes the following form (lie / lied / lied - lying).

  !To lay can also describe a chicken or other animal who produce eggs. The hen laid two eggs this morning.

  - See more at: http://www.learnenglish.de/mistakes/layvslie.html\#sthash.k3Yp1RDR.dpuf