at six

• The plane was noticed to take off at six by them
  他们注意到那架飞机六点起飞了。
• Please ring me up at six o ' clock tomorrow morning
  请明天早上六点钟给我打个电话。
• We are accustomed to paying by ~ s at six months
  我们的惯例是以六个月的期票支付。
• Then i arrived home at six o ' clock yesterday evening
  后来，我昨晚6点钟回到家里。
• We ' ll have dinner at six thirty . are you hungry
  我们六点半吃晚饭。你饿了吗？
• The shop was closed at six o ' clock in the afternoon
  296这个商店下午六点关门了。
• If he started at six , he ought to be here now
  要是他六点出发，现在总该到了。
• If you ask me , we should leave at six o ' clock
  如果让我来说，我们得在六点走。
• I dis not think he came home at six yesterday
  我认为他不是昨天6点钟回家的。
• The dog left the flowerbed at sixes and sevens
  这条狗把花坛践踏得花叶凋零。