What is the difference between "its" and "it's"?
"Its" denotes possession; "It's" is a contraction of "it is" or "it has".
Each of the participants ___ a certificate after completing the program. (receive / receives)
Each of the participants receives a certificate after completing the program.
“Each” is singular, so it takes a singular verb (“receives”).
Its a beautiful day outside.
It's a beautiful day outside.
By the time the movie started, we ___ (find) our seats.
By the time the movie started, we had found our seats.
The action of finding seats happened before another past action (“movie started”), so use the past perfect.
Everyone must bring ___ own laptop.
Everyone must bring their own laptop.
In modern usage, singular “they/their” is accepted for indefinite pronouns like “everyone.”
What is the difference between "loose" and "lose"?
"Loose" means not tight; "lose" means to fail to keep or to be defeated.
A number of researchers ___ new methods to solve the problem. (develop / develops)
A number of researchers develop new methods to solve the problem.
“A number of” refers to many researchers (plural), so use the plural verb “develop.”
After the meeting we went out for dinner.
After the meeting, we went out for dinner.
Introductory phrases should be followed by a comma: “After the meeting, we went…”
She ___ (work) in this company for five years before she got promoted.
She had worked in this company for five years before she got promoted.
The action happened over a period of time before another past event, so use past perfect.
Between you and ___, this plan might not work. (I / me)
Between you and me, this plan might not work.
The pronoun follows a preposition (“between”), so it must be in the object form (“me”).
What is the difference between "affect" and "effect"?
Affect means to influence, while Effect is the result of an action.
Neither the manager nor the employees ___ the new policy fully. (understands / understand)
Neither the manager nor the employees understand the new policy fully.
With “neither…nor,” the verb agrees with the subject closest to it (“employees,” plural).
She loves reading, she goes to the library every week.
She loves reading; she goes to the library every week.
Two independent clauses cannot be joined by just a comma. Use a semicolon or add a conjunction: “She loves reading; she goes…”
I wish I ___ (know) how to solve this problem.
I wish I knew how to solve this problem.
After “wish” (present), we use the past simple to talk about unreal present situations.
The teacher gave extra work to Sarah and ___. (I / me)
The teacher gave extra work to Sarah and me.
The pronoun is the object of the verb “gave,” so use the object form (“me”).
What is the difference between "lie" and "lay"?
"Lie" (past tense: lay) is to recline. "Lay" (past tense: laid) requires a direct object, meaning to place something down.
The team of engineers ___ a solution after weeks of testing. (find / finds)
The team of engineers finds a solution after weeks of testing.
The subject is “team” (singular), so it takes a singular verb, even though “engineers” is plural.
He said “I will be late”.
He said, “I will be late."
In standard American English, punctuation goes inside quotation marks: “I will be late.”
If she ___ (leave) earlier, she would have caught the bus.
If she had left earlier, she would have caught the bus.
This is a third conditional (unreal past), so use “had + past participle.”
It was ___ who organized the entire event. (she / her)
It was she who organized the entire event.
After “it was,” we use the subject pronoun in formal English (“she”), not “her.”
What is the difference between "compliment" and "complement"?
A compliment is praise; a complement adds to or completes something.
Ten years of research ___ significant progress in this field. (produce / produces)
Ten years of research produces significant progress in this field.
A period of time treated as a single unit takes a singular verb (“produces”).
My brother who lives in Canada is visiting us.
My brother, who lives in Canada, is visiting us.
Nonessential clauses should be set off with commas.
No sooner ___ (has/make) the announcement than the audience started reacting.
No sooner had he made the announcement than the audience started reacting.
After “no sooner,” we use inversion with the past perfect: “No sooner had he made…”
No one in the group brought ___ notebook to the meeting. (his or her / their)
No one in the group brought their notebook to the meeting.
“No one” is singular, but in modern English, singular “they/their” is commonly used to avoid awkward or overly formal phrasing like “his or her.”