do and does ka kese pta chalega ki use kb hoga kyuki isme are ka bhi hua u h use

'Do' is plural. so use it with plural subjects. I do my job. Do you write a letter? we do not play cricket. 'Does' is singular. so use it with singular subjects. He does his job. Does john write a letter ? Rosy does not read a story.

singular plural ke base pe pata chalega