法规若有变动，所有现行合同都需重新审查。
If it were to change, all existing contracts would need to be re-examined.
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If英 /ɪf/|美 /ɪf/
it英 /ɪt/|美 /ɪt/
were英 /wɜː/|美 /wər/
to英 /tuː/|美 /tu/|英 /tə/|美 /tə/
change英 /tʃeɪndʒ/|美 /tʃeɪndʒ/
解释
"if it were to change" 构成正式虚拟条件句，were + to-不定式引入假设性法律变动，主句用 would need to 说明假设条件下的必然反应
If it were to change, all existing contracts would need to be re-examined.
"if it were to change" 构成正式虚拟条件句，were + to-不定式引入假设性法律变动，主句用 would need to 说明假设条件下的必然反应