となれば

expression

if it comes to; when it comes to; if it becomes

Conditional expression used to set up a hypothetical or real situation, often with a nuance of 'if things reach that point' or 'when it comes to that'. Follows nouns, na-adjectives, or verbs in dictionary form.

• 彼かれが来くるとなれば、準じゅん備びを急いそがないと。

  If it comes to him coming, we have to hurry the preparations.

• 試し験けんに落おちるとなれば、進しん路ろを考かんがえ直なおさなければならない。

  If it comes to failing the exam, I'll have to reconsider my path.