BUT...
ALL other sentences use chachas!
... and, just like a palace has a special chacha for every function...
...there is a "chacha" for every function in English.

1. "Be" + Gerund     =    Continuous tenses

"I am working"
"He was working"


2. "Have" + Past Participle    =   "Perfect" tenses

"I have worked"
"We had worked"


3.  "Do" +  Root   =    Present & Past Negatives & Questions

"I do not work"
"She does not work"
"Do you work?"
"Did she work?"


4.  All 10 "chachas" +  Root  = all other functions in English.

"I can work"
"He must work"
"We should work"
Combining the 6 forms of each verb and the 13 chachas produces every possible verb tense in English!