I am not understanding that where I use do,does ,s ,es, or did, 2nd form, is,are,am, have ,has, was,were, had

Hi, We have to use Do for First person(l),second person (you) and all others plurals in the present tense . Does used for he, she, it in present tense. remember ., I do, you do, they do but he does, she does, it does . in the past tense we use Did for all . I did, she did...etc . have used in present perfect. Do- have does - has I have, you have . but she has, it has. had used in past perfect . had-did am always comes along with I . it is similar to is, was (be verb). I am, he is, she was...