The following are some common usages of buy and their fixed collocation:
Purchase+noun
Buy+ nouns mean "shopping", for example:
I want to buy a new mobile phone. )
She bought a dress for the party. She bought a skirt for the party. )
2. buy+ infinitive
Buy+ infinitive means "buy a service or opportunity", for example:
He bought a ticket for the concert. He bought a ticket for the concert. )
She bought a membership in the gym. )
3. buy+ prepositional phrase
Buy+ prepositional phrase means "buy something at a certain cost or in a certain way", for example:
He bought the car for10,000 dollars. He bought the car at a price of 1 ten thousand dollars. )
She bought the house with a mortgage. )
4.buy + from
Buy+from means "buy something from someone or somewhere", for example:
I always buy groceries at the local market )
She bought this book from the bookstore. She bought this book from the bookstore.
In addition to the above usage, buy has some common fixed collocations, such as:
Bulk purchase (bulk purchase)
buy/purchase on credit
Buy all the shares
To buy (stocks or investments).
Time of purchase (purchase time)