"lie" 作为系动词时，后面可以接形容词、现在分词或过去分词作为表语。以下是一些例句：

1. If you feel unwell, go and lie down.

2. My hometown lies low in a hidden valley.

3. She lies still in bed.

4. He always keeps silent at meeting.

希望这些例句能帮助你理解 "lie" 作为系动词的用法。