关于英语词组造句的问题

1.我们每个人都必须遵守这个重要的决定。（用词组abide by）Everyone of us must abide by this important decision.2.以往的夏天，我们经常在湖上划船。（用词组used to do sth.）During past summers, we used to go boating on the lake.3.朋友之间往往只用“嗨”来打招呼。（用词组tend to ...