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Difference between modal verbs and other verbs

Modal verbs	Examples
do not have the ending -s with he, she, it	My daughter is four years old and she can read and write. Mr Johnson can come tomorrow.
do not require an auxiliary verb (be, do, have)	Can you close the window, please? BUT: Does he always close this window?
do not have forms in the past (except "could") and in the future	I must go to the dentist. BUT: I needed to go to the dentist yesterday.
do not require "to" before the second (main) verb	We may sit here. BUT: I want to sit here.