The same pattern as the previous track, now filled out. Find the base and the endings are already known.
Hizo is spelled with a z because hic- plus -o would spell "hico" and change the sound.
¿Dónde lo pusiste? · Ponía (the line past, regular)
The most irregular of all, on two counts: it does not follow the mixture rule, and it serves as the point past of both ser and ir.
fui = I was, and I went
No fui · No fue
By the rule, they would be "fuieron", which is awkward to say. So the i dropped out, and the same happened in two other verbs.
Now the reason is clear. Building the past mood tense from the they point past means every irregularity, including these dropped i's, carries straight across.
fueron → fuera · dijeron → dijera · tuvieron → tuviera
Si yo fuera tú (if I were you) · Si lo tuviera, te lo contaría · Quería que lo hicieran · Quería que lo hiciéramos
English marks this the same way, with were rather than was, so the hypothetical past is mood tense in both languages.
Practical advice for real conversation. Decir is very irregular in would, so if you do not want to deal with it mid-sentence, reach for contar instead, which also means to tell.
Si lo tuviera, te lo contaría.
Spanish likes to close with that lo: I would tell you it.
The teacher is explicit that installing all this irregular content is not the aim. The aim is exposure to how the irregulars work, so that you can manage them while practising.
Two memorable pairs from this track: vino con vino (he came with wine) and traje un traje (I brought a suit).