1.-  We use must + perfect infinitive when we feel sure about something in the past.
       We use might, may or could with the perfect infinitive to say that we think something was possible but we aren’t sure.
       We use can’t + perfect infinitive when we feel sure something didn’t happen in the past. 

A) She have done her project. ---- wrong
B) She must have done her project.---- good

http://learnenglish.britishcouncil.org/en/grammar-reference/modals-%E2%80%93-deduction-past

2.-   Do and does are used when we want to ask yes/no questions.
          We use do when the subject is I, you, we or they.
       We use does with third person singular pronouns when the subject is he, she or it.

A) Does you want to go to the cinema? --- wrong
B) Do you want to go to the cinema? --- good 

http://www.ecenglish.com/learnenglish/lessons/do-or-does

3.- The words much and many mean a lot of.
      If a noun is in singular, we use much.
      If a noun is in plural, we use many .

A) I have many mermelade. --- wrong
B) Ihave much mermelade. --- good
                                                                      
http://www.ego4u.com/en/cram-up/vocabulary/much-many        

4.-  When we want to talk about future facts or things we believe to be true about the future, we use 'will'.
     If you are making a future prediction based on evidence in the present situation, use 'going to'.

A) I will go to the park. --- good
B) I going to the park. --- wrong

http://www.englishgrammarsecrets.com/goingtoorwill/menu.php

5.-  Has ---- he, she, it
      Have ---- I, you, we, they

A) She have a motorcicle. --- wrong
B) She has a motorcicle. --- good

http://www.learnenglish.de/grammar/verbtohave.html