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| l | When you don't
want to identify or mention a |
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| specific subject
in the subordinate clause, the |
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| impersonal
expression is followed by an |
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| infinitive: |
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| l | Es
necesario hacer las tareas. (It is |
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| necessary to do
the homework.) Es |
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| necesario
que los estudiantes hagan las |
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| tareas. (It is necessary that the students do |
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| the homework.) |
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