93. I can't write to Linh because I don't have her address.  
   -> **If I had her address, I could write to Linh.**

94. Dick often causes accidents because he drives carelessly.  
   -> **If Dick didn't drive carelessly, he wouldn't often cause accidents.**

95. We can't give much help to the poor because we waste a lot of money on unnecessary things.  
   -> **If we didn't waste a lot of money on unnecessary things, we could give more help to the poor.**

96. Peter is fat because he eats so many chips.  
   -> **If Peter didn't eat so many chips, he wouldn't be fat.**

97. Today isn't Sunday. The pupils can't go swimming.  
   -> **If today were Sunday, the pupils could go swimming.**

98. We haven't got a big house. We can't invite friends to stay.  
   -> **If we had a big house, we could invite friends to stay.**

99. Be calm, or you'll make a wrong decision.  
   -> **If you aren't calm, you'll make a wrong decision.**

100. She is often absent from class, so she can't keep pace with her classmates.  
   -> **If she weren't often absent from class, she could keep pace with her classmates.**

101. If she doesn't hurry, she'll miss the bus.  
   -> **Unless she hurries, she'll miss the bus.**

102. She can't walk without help, so she doesn't go out very often.  
   -> **If she could walk without help, she would go out more often.**

103. There will be a shortage of water unless it rains.  
   -> **If it doesn't rain, there will be a shortage of water.**

104. Unless someone has a key, we can't get into the house.  
   -> **We can only get into the house if someone has a key.**

105. Unless it stops raining, we won't go out.  
   -> **If it doesn't stop raining, we won't go out.**

106. Listen to the teacher's explanation or you can't understand anything.  
   -> **If you don't listen to the teacher's explanation, you can't understand anything.**

107. Because Alan never eats breakfast, he always overeats at lunch.  
   -> **If Alan ate breakfast, he wouldn't always overeat at lunch.**

108. Unless he phones immediately, he won't get any information.  
   -> **If he doesn't phone immediately, he won't get any information.**