which verb tense is this

elles aient tort

also what tense is

il rigolait

"AVOIR tort" means "ne pas avoir le droit, la raison de son côté".

So "aient tort" is from the verb avoir, and it is in the third person plural, subjunctive mood.

que j'aie
que tu aies
qu'il, elle ait
que nous ayons
que vous ayez
qu'ils, elles aient.

By the way, a copy of the reference for verbs, the "Bescherelle" would be a good investment for anyone learning the French language.

Il rigolait is the imparfait form of the verb rigoler, meaning Rire, s'amuser.

The complete conjugation is:
je rigolais
tu rigolais
il, elle rigolait
nous rigolions
vous rigoliez
ils, elles rigolaient

The verb tense used in the phrase "elles aient tort" is the subjunctive present in French.

To determine the verb tense, you can look for certain patterns and conjugations. In this case, "aient" is the conjugated form of the verb "avoir" in the third person plural of the subjunctive present. The subjunctive mood is used to express actions that are uncertain, hypothetical, or subjective.

To form the subjunctive present tense in French, you typically take the third person plural form of the present tense indicative and replace the ending with the appropriate subjunctive ending. In this case, the third person plural form of "avoir" is "ont" in the indicative present tense. You replace "-ont" with "-aient" to form the subjunctive present tense: "aient."

So, "elles aient tort" translates to "they are wrong" in English, using the subjunctive present tense.