1: I don't know his number, so I don't phone him
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2: He doesn't invite me to his birthday party, so I can't come there
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3: The motor is expensive, so I can't affort it
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4: I have to work tomorrow evening, so I can't meet you
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5: We don't visit you very often because you live so far away
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6: Because he doesn't understand the lesson he can't do the exercise
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7: She studies very hard so her parents are proud of her
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8: He doesn't speak very clearly, that's why people don't understand him
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1. If i knew his number , i would call him
2. If he invited me to his birthday party,i could come there
3.If the motor were expensive , t could affort it
4.If i didn't have to work tomorrow evening,i could meet you
5 If you didn't lived so far away, i could visit you very often
6. If he understood the lesson ,he could do the exercise
7.If she didn't study hard ,her parents would be proud of her
9.If he spoke very clearly ,people could understand him.