1.My parents are unhappy because I get bad mark.(If)
If I got good mark, my parents would be happy
2.I had a fever,so I didn't go to the party yesterday (because)
Because I had a fever, I didn't go to the party yesterday
3.No river in the world is longer than Nile river.(Nile river)
Nile river is the longest river in the world
4.You mustn't use mobile phone in class, boys.(Don't)
Don't use mobile phone in class, boys
1.If I get bad mark, my parents will be unhappy
2.I didn't go to the party yesterday because I had a fever
3.Nile river is the longest river in the world
4.Don't use mobile phone in class, boys
1.My parents will unhappy if i get bad mark
2.Because I had a fever so I didn't go to the party yesterday
3.The Nile river is the longest river in the world
4.Don't use mobile phone in class,boys