It's years (since) I enjoyed myself so much.Why?

问题描述:

It's years (since) I enjoyed myself so much.Why?

it's + 一段时间+since+一般过去时

It + be + 时间长度 + since + 过去式的句子。 “某人已经(多久)不做某事了”

现在完成时 It's等于IT has been加时间 since后加过去时