Had I time,I would come.
这里had为实意动词为何可以倒装？
不能。只有当 if 从句中含有 should, were, had done 的状况下，才能省略 if ，把 should, were, had 提前，产生部分都装。比如：
Had I had time yesterday, I would have gone to your party.
若我昨晚有空，我会去参加你们的聚会的。
Had she studied harder, she would have passed the exam. 倘若以前她好好学习的话，她就会考试及格了。
Had it not been for the captain，the ship would have sunk.假如不是船长，船就沉没了。
Were she my friend，I would ask her for help.假如她是我的朋友，我就会请她帮忙。
Were it to rain tomorrow, we would put off the basketball match. 假如明天下雨的话，大家将推迟举行篮球比赛。
Should he come tomorrow，I would tell you.假如他明天来，我就对你说。
Should the journeyer return, this stone would utter speech.“行人归来石应语。”
