ことがよくあった

often did

→ こと
phrase Rare #42,111
often did Used after a verb in the plain form to describe something that often happened in the past or was a past habit. It is often translated with “would often” or “used to.”
JA: 子どもの頃、祖母の家で昼寝をすることがよくあった。
EN: When I was a child, I would often take naps at my grandmother’s house.