Add some salt to the soup?

a pinch of salt

a tiny bit of salt

2009-09-11 16:35:11 補充：
The cook and housekeeper's complete and universal dictionary: including a ...‎ - 第 392 頁
Mary Eaton 著 - 1822 - 495 頁
When ready to serve, add this to the soup, and season the whole with salt.
SPROUTS. ... Shred some onion, and sprinkle it among them, and also some sugar.

The thorough good cook: a series of chats on the culinary art, and nine ...‎
George Augustus Sala 著 - 1896 - 492 頁
第 136 頁
German Wine Soup. Put some water, some sugar, and some cinnamon-bark into a
saucepan. Boil, and add wine equal in quantity to the water. As soon as the soup

Jane Brody's Good food book: living the high-carbohydrate way‎
Jane E. Brody 著 - 1985 - 700 頁
第 264 頁
Add a few tablespoons of uncooked farina to the soup, and cook it, stirring, for
about 5 minutes. • Remove from the pot some ...
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Add xxxxx TO something <-------------This is more commonly used.
You may say it in some different ways.
Here they are:
1) Put a tiny bit of salt INTO the soup
2) Put a pinch of salt INTO the soup
3) Put some salt INTO the soup
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4) Add a tiny bit of salt TO the soup
5) Add a pinch of salt TO the soup
6) Add some salt TO the soup
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
" to add something into the soup" is okay, too.
It is just that it is not very commonly used.
As a native English speaker, I have heard " to add xxx to xxx" more.

Good luck with your studies.

Hope that helps.

Ciao

要用 into
Add some salt into the soup.