Срочно. Помогите!!!
 If Boris.....(be) happy, he always.....(sing) a lot.
 If а you.......(not understand) something, you.....(should/talk to) your teacher.                      I.....(listen) to   some good music if i.....(feel) sad. 
 You......(can/send) e- mails if you......(have) a multimedia mobile.
 If i.......(not sleep) enough, i......(get) very tired.
You......(should/study) hard if you.....(want) to do well in the exams.
 If Alex......(not eat) regulary, he.....(get) very bad-tempered!

If Boris is happy, he always sings a lot. If you don't understand something, you should talk to your teacher.                      I listen to   some good music if i feel sad.  You can send e- mails if you have a multimedia mobile. If I don't sleep enough, i get very tired.You should study hard if you want to do well in the exams. If Alex doesn't eat regulary, he gets very bad-tempered!