How mush/many cartons of Milk did you buy?
How mush/many butter Will you use for the cake?
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How many cartons of milk did you buy?

How much butter will you use for the cake?

ответ: 1 - many.

2 - mush.

Объяснение: many - для исчислчемых предметов. То есть таких, которые можно посчитать, не добавляя к ним уточнений. Например: много полотенец, много девочек.

А mush - для неисчисляемых. Например: мы же не можем сказать два масла, так? И считаем мы предметы такого типа так: два ломтика масла. Или два куска хлеба. Два стакана воды. И тому подобное.

1 You ate the chicken, but you (didn't eat) the chips.

2 l enjoyed the acting in the film, but I didn't enjoye the songs.

3 We visited the castle, but we didn't visit the museum.

4 I studied science at school, but I didn't study history.

5 They had something to drink, but they hadn't anything to eat.

6 She downloaded some music, but she didn't download the film.

7 He talked about his job, but he didn't talk about his family.

8 I liked him, but I didn't like his wife. ​