10. The journalist asked, "Has your country formed a military alliance with anyone?" → The journalist asked if their country (form) a military alliance with anyone.

Решение:

В прямой речи глагол 'to form' стоит в Present Perfect ('has formed'). При переводе в косвенную речь после 'if' происходит смена времени на Past Perfect. Глагол form ставим в форму had formed.

Ответ: had formed