Unit12 Firefirefa(r) n.火 玩火：play with fireDont play with fire.不要玩火。Fire is dangerous.We must be careful.We play with fire.must /mst/ 必须，应该We mustnt play with fire. mustnt must not=/msnt/禁止Dont play near fires!We play near fires.careful kefl小心的We must be careful with fire. 我们必须小心火。（ be） careful with当心 .Whats in the boys hand?matches mt n. 火柴；比赛 可数 n. 复数形式 matches 我有一些火柴。 I have some matches.matchDont play with matches!We _ play with matches.Mustntsmokesmkn.烟v.抽烟We mustnt smoke in the forest.我们在森林里禁止吸烟。
