Maybe she's there. 可能她在那儿。
maybe 是副词，意思是
"也许、可能"，在句中作状语，相当于perhaps，常位于句首。如：
Maybe she'll come this afternoon. 她可能今天下午来。
Maybe you put the letter in your pocket. 大概你把信放在衣袋里了。
而may也有可能之意，may be中的may是情态动词，be 是动词原形，两者构成完整的谓语形式，与主语形成系表结构意为"也许是......可能是......"。如：
I can't find my watch. It may be in your bag. 我找不到我的手表了,它可能在你的包里。
He may be a soldier. 他可能是个军人。
maybe 和may be有时可以互换。
He may be in the office.（=Maybe he is in the office.）他或许在办公室。
You may be right.（=Maybe you are right.）你或许是对的。