X-Words

 RULES FOR X-WORDS

do
does  
did 

may
might

can
could                                                    BASE FORM

will
would

must

should

has
have                                                PAST PARTICIPLE
had

am
is
are                                                       -ING FORM (ACTIVE)

                                                OR

was
were
                                                            PAST PARTICIPLE (PASSIVE)                                   

have

                                    PAST PARTICIPLE

being

be                                                        -ING FORM (ACTIVE)

                                                                        OR

                                                PAST PARTICIPLE (PASSIVE)

been

1.  The X-Word rules always work.  If you follow them, the FORM of the verbs      
      you use will always be correct.

2.  X-Words are NEVER followed by the S FORM or the PAST FORM of verbs.

3.  The BASE FORM is NEVER the first word of a STATEMENT.  However, it

     can begin a question or a command.

 4.  If you use a VERB FORM after a preposition, it MUST be the –ING  FORM.

 5.  After  “TO” we almost always use the BASE FORM.