where we use do and does and has have give me one or two examples so then I can understand it

we use do&have with I, you, they, we and with plural subject. e.g - I have a pen. Ram and Sham have a pet dog. They have done their work. I do my work honestly. and does& has with He, she, it and with singular subject. e.g - He has an umbrella. She has taken her lunch. Mohini has a big house. Ram does not lie.

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