scarcely位于句首时，倒装在scarcely主句中进行。scarcely所在的主句内，谓语动作发生在when或before从句内的谓语动词之前，因此主句用过去完成时，从句用过去时。不能用than代替句中的when。
scarcely when用法
1、The journey's scarcely begun when he discovers a stowaway: Russell，a chubby，maladroit Wilderness Explorer Scout who's out to earn his Elderly Assistance Badge.
旅途的开始时，他发现几乎没有一个偷渡者：罗素，一个胖乎乎，笨拙荒野浏览器斯考特谁的，去挣他年迈的援助徽章。
2、Butday had scarcely appeared when we saw our cruel enemy，with two other giants，a most of the same size，leading him; and a great number were coming before him at a quick pace.
但是天刚刚发光，我们就见到我们残虐的仇人，同着另两个大人，差不多大小，领着他并且还有一大群人在前面非常快的走来。
scarcely when双语例句
She was scarcely 18 when she made her debut.
首次出镜时，她刚满18岁。
He was scarcely awake when he heard the knock at the door.
他刚醒来就听见有人敲门。
Bruce had scarcely shaken our hands when the phone rang.
布鲁斯刚和我们握了握手，电话就响了。
