FIRST CONDITIONAL
http://www.oup.com/elt/global/products/headway/int/a_grammar/unit09/hwy_int_unit08_2
http://www.oup.com/elt/global/products/headway/int/a_grammar/unit09/hwy_int_unit08_2
SECOND CONDITIONAL
http://www.oup.com/elt/global/products/headway/int/a_grammar/unit09/hwy_int_unit09_2/
http://www.oup.com/elt/global/products/headway/int/a_grammar/unit09/hwy_int_unit09_2/
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