Modals are helping words that are used to express: (1)possibility, (2)ability, (3)degree of certainty, and (4) level of authority Kinds of modals such as: Can, could, may,might, must, ought to, shall, should, will, and would.
— Definition of finite verb :
a verb that has a subject, this means that it can be the main verbs in a sentences. It shows tense (past/present, etc) or number (singular/plural), A finite verb makes an assertion or expresses a state of being and can stand by itself as the main verb of a sentence.
Prepositions of time indicate the timing of things. Example: “I get up at 7.00″shows the time when I wake up. Some of the most common prepositions of time is : in, on, at.