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1·I don't know what to say.

我不知道说什么好。《牛津词典》

2·Nobody knew what to say.

谁也不知道该说什么。《牛津词典》

3·She stared blankly into space, not knowing what to say next.

她两眼发直，不知道下面该说什么。《牛津词典》

4·I was the person who didn't know what to say.

我是那个不知道该说什么的人。

5·We all have the power to choose what to say.

我们都有选择说什么的权力。

6·At first, I didn't know what to say, but luckily, she was really friendly.

起初，我不知道该说什么，但幸运的是，她真的很友好。

7·He sent me a few messages, but I haven't replied yet as I don't know what to say.

他给我发了几条短信，但我还没有回复，因为我不知道该说什么。

8·I wouldn't know what to say.

我不知道该说什么。

9·He couldn't remember what to say.

他不记得该说什么了。

10·We held each other's hand, not knowing what to say.

我们握住彼此的手，不知说什么好。《新英汉大辞典》