Do, does, did

“ Do”  forms( do, does, did )           

'Do' form	Positive sentences	Negative sentences	Questions
Do (Simple Present)	I/we/you/they play cricket.	I/we/you/they do not play cricket.	Do I play cricket?
Does (Simple Present)	She/he/it plays cricket.	She/he/it doesn’t play cricket.	Does he play cricket?
Did (Simple Past)	I/we/you/he/she/it played  cricket.	I/we/you/he/she/it didn’t play cricket.	Did they play cricket?

Note:   ‘Do’  forms are used to make  Negative sentences and Questions in Simple Present & Simple Past Tenses only. All ‘do forms’ take only V1 after them.‘done’ is V3 ( past participle) , not a helping verb.
  

	Simple present	Simple Past
Singular	does	did
Plural	do	did

  

•  Play  (V1)    =    do + play  ( we expand V1 into  ‘do+ play’ in questions & ‘do+not+play’ in negative sentence )
•   Plays ( S-form) =    does + play   
•   Played  ( V2)      =    did + play 

·   We can also use ‘do forms’ even in Positive sentences to emphasize an action:

Ex :  Please do attend the party.

        He does come regularly.

        I did attend the class yesterday.