1. The last time we were to a concert was over a year ago.
2. How long is it since you last rode a bike?
When + did + S + last + V? = How long is it since + S + last + V?: lần cuối làm gì cách đây bao lâu.
3. It..hasn't rained sinse fornight ago....
4. Tom had arrived in Scotland on Friday the previous week.