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"Chachas"*
*Note:  "Chacha" is a term used by Ely Freedman and her students to help understand English.
It is NOT a real grammar word.
Just like a "chacha" helps a housewife, auxiliary words in English help the principal verb.

There are 3 auxiliary verbs:

Be
Have
Do


...and 10 "chachas" that act as signals:

Can
Would
Could
Should
Will
May
Might
Must
Shall
Ought to