Spanish Native speaker here!
1) haz, no hagas
2) poner, no pongas
3) estudiamos, no estudies
4) leímos, no leas
5) comiste ,no comas
6) hablaste, no hables
7) escribieron , no escribas
8) tomaron, no tomaste
9) miraron, no miren
10) practicaron, no practiquen
11) bañaron,no bañaste
12) dormir, no duerman
13) cuidaron, no cuiden
14) cepillaste,no cepillar
15) levantar,no levanten
Hope this is correct
A and B in algebra stand for any variables of real numbers. A real number is a value of a continuous quantity that can represent a distance along a line. So if you see A and B in doing your algebra it is just a representation of a value that you need to find.
