Prepositions Used to Express Time Periods
▶️ within
Within" is used to express that something will happen inside a certain time period.
I will finish the report within two days (The report will be completed no later than two days from now.)
The clothes I bought online are supposed to arrive within a week.
We'd better find a new place to live within two months, otherwise we'd be homeless.
The wedding is in six months, so we need to finalize all the details within that time frame.
▶️ during
"During" is used to say when something happens and it is often followed by a noun that represents an event or a period of time.
I met a lot of interesting people during my stay in New York.
What did you do during the weekend?
I plan to visit my grandparents during the holidays.
Consumer spending had dropped significantly during the past eight months.
During the first few minutes of the meeting, the power was out.
▶️ throughout
"Throughout" refers to the entire duration of a period of time or every part of a place. It is used when something is continuously happening during a certain period, or in all parts of a certain area.
It rained throughout the night (This sentence indicates that it rained all night without stopping.)
I was really bored throughout the meeting.
I worked throughout the week as the deadline was approaching.
It's important to stay hydrated throughout the day, especially in hot weather.
▶️ for
In terms of time, "for" is used to specify the duration or length of time an action has been occurring.
I've been waiting here for two hours.
James has lived in Canada for five years.
Kevin has worked as chief of the advertising section of our company for ten years.
The interview went on for almost 3 hours.
▶️ in
When combined with a specific period in the past, 'in' is used to signify 'during that certain period'. Similarly, 'in' plus a certain period in the future means 'during that upcoming period'. for example, 'in the past few years', 'in 10 minutes', or 'in a week'.
In the last six years, the value of a house has increased by 35% in this country.
I haven't gone outside very much in the past few years.
I want to lose at least 10 pounds in two months.
Can you finish the job in two weeks?
She could get that essay done in a couple of hours if she really tried.
I'm just setting off, so I should be with you in half an hour.
I haven't had a decent night's sleep in years.
▶️ until/till
We didn't eat till past midnight.
We waited till nine to have breakfast because that was when our favorite cafe opened.
I was up until three o'clock trying to get my work finished!
The conference is postponed until the end of this month.
Mr. Garcia will be out of the office until June 18.
▶️ by
All staff are required to hand in the report by 6 p. m.
I will finish my homework by 4 p. m.
Can we finish this meeting by five? I have to pick up my son at five-thirty.
▶️ since
Susan has worked for the payroll department at the headquarters since she joined the company 5 years ago.
He has been unemployed since last June.
I have been happily married for 14 years, since the age of 22.
▶️ before/before
The construction work will be completed before August.
Most landlords require full payment of the security deposit before the tenant receives the keys.
I need to clean out my closet before the end of the summer and donate any clothes I no longer wear.
Tenants should clean the apartment a few days before the move-out date.
before going back to school, I will need to make arrangements for childcare if necessary.