We could (past ind) speak English with them.They asked (past ind.) us about our town.We had (past ind.) a talk about schools and shoolchildren in Japan.I learned (past ind.) many interesting things.
Все глаголы в простом обычном времени - past indefinite, так как идет повествовательный рассказ о том, что мы сделали в они спросилио том-то, я узнал то-то.
We could speak English with them.They asked us about our town.We had a talk about schools and shoolchildren in Japan.I. learnt many interesting things.