105. If she had taken her friends' advice, she wouldn'n have failed in her business.

106. If his friends hadn't been late, they wouldn't have missed the train.

107. If today was Sunday, the pupils could go swimming.

108. If we had gotten a big house, we could invite friends to stay.

109. If you wasn't calm, you would make a wrong decision.

120. If she wasn't absent from class, she could keep pace with her classmates.

121. If he hadn't missed the train, he would'n been late.

122. Unless she hurry, she'll miss the bus.

123. If she could walk without help, she would go out very often.

124. If it doesn't rain, there'll be a shortage of water.

125. If we had enough money, we would go on holiday.

126. We can only get into the house if someone has a key.

127. If it stopped raining, we would go out.

128. Water couldn't run down hill without gravity.

129. If i hadn't studied hard, i wouln'd have passed the final examination.

20. If you don't listen to the teacher's explanation, you can;t understand anything.

21. If i hadn't been sick yesterday, i would have gone to class.

22. If Alan ate breakfast, he wouldn't be overeat at lunch.

23. If John had helped Peter, he could have finished unloading the truck.