Найди в предложении глагола to be и подчеркни его sam is at school you are a baby our friends are sportsmen nick and mike are brothers my mother is at work i am a doctor we are not pupils are you from russia she is not from england is it a table it is not a table your telephone number is 7654356780 my favorite spots are tennis and chess what is your name are you a good pupil? yes? i am.
и всё..
подчеркиваешь am,is,are .это формы глагола to be.