昨天晚上他是大约九点上床睡觉的英文

a. he went to bed about nine yesterday evening

• 昨天:    yesterday
• 晚上:    evening; night
• 他:    he
• 是:    Semantics
• 大约:    approximately; abo ...
• 九:    nine
• 点:    drop
• 上床:    bedward; go to bed
• 睡觉:    sleep; fall asleep ...