Put the verbs in brackets into the correct present/past perfect tenses. 1) (everyone/already/start) their presentations on timekeeping devices? I’m feeling lost because I 2) (plan) to present the water clock, but I 3) (just/learn) that someone else 4) (work) on that topic since yesterday. Which topics 5) (not/choose) yet?
2) Hi Rob! Candle clocks 6) (select) by Julie, but after she 7) (research) them for a few hours, she decided to present the hourglass instead. So candle clocks are available, but Julie’s problem was finding up-to-date resources. Although the passing of time 8) (measure) with candles from Europe to Japan before the invention of the mechanical clock, not a lot. 9) (write) about candle clocks.
