If ) happy, he ) a lot. if а understand) something, /talk to) your teacher. ) to some good music if ) sad. /send) e- mails if ) a multimedia mobile. if sleep) enough, ) very tired. /study) hard if ) to do well in the exams. if eat) regulary, ) 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!