1. Belong to / Belong with / Belong in
Belong to means ownership or possession:
(a) That’s our neighbour’s dog. = That dog belongs to our neighbors.
Belong with means that things/people are similar and should be together
For example “You belong with me,”
it is like saying that it is destiny for the two people to be together.
You can also use belong with or belong in for putting an object into a category with other, similar objects:
(a)That book about humans traveling to Mars doesn’t belong in the history section.
2. Amount / Number / Quantity
Use amount with uncountable nouns – things that cannot be separated or counted.
For example (a) This recipe requires a small amount of wine.
(b) I have a huge amount of work to do this week.
Use number with countable nouns – words that can be counted and made plural:
(a) A number of my friends are teachers.
The word quantity is a more technical/formal word for number or amount, and it is used for things you can measure (usually objects, not people).
(a) We have a limited quantity of special-edition hats for sale. hats = countable
(b) They need a large quantity of cement for the construction. (or: a large amount of cement) cement = uncountable
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