你好！很高兴为你解答。

如果你想表达“而不知如何”的意思，你可以使用以下表达方式：

"not knowing how"

例句：

"She didn't know how to swim, so she stayed on the shore." (她不会游泳，所以呆在岸边。)
"He didn't know how to fix the car, so he had to take it to the mechanic." (他不会修车，所以必须把车送到修车厂。)
"being unaware of how"

例句：

"She was unaware of how to use the new software, so she asked for help." (她不知道如何使用新软件，所以向他人寻求帮助。)
"He was unaware of how to pronounce the word, so he looked it up in the dictionary." (他不知道如何发音这个单词，所以查阅字典。)

希望这些信息对你有帮助！