Perfect Tenses
The form of this verb tense is S + have/has + past participle.
What is the present perfect?
The following sentence is an example of this type of clause.
I go to a gym that recycles its own waste.
What is an identifying subject clause?
Noun clauses with wh words use this statement word order.
What is S + V?
These two modals of future probability are used to express information that is very certain. Negative forms can be included.
What is 'will' and 'won't?'
Correct the error in the following sentence.
He might working.
What is 'be working?'
This verb tense is used to describe two past events in which one event happens before another.
What is the past perfect?
This relative pronoun is used for possession.
What is the pronoun whose?
Noun clauses with 'if' and 'whether' can also include these words in the sentence.
What is 'or not?'
These three modals of present probability are used when there is one logical conclusion.Negative forms can be included.
What is must, must not and have to?
Correct the error in the following sentence.
The students must have not had strong passwords because a thief hacked their laptops.
What is must not have?
These four adverbs can be used to describe an action or event that happened at an unspecified time in the past with the present perfect.
What are already, never, ever, yet?
The following sentence is an example of this type of clause.
Renewable energy, which is currently being researched, is an important future resource.
What is a nonidentifying subject relative clause?
The following sentence is an example of this type of question.
I wonder who invented the hair dryer.
What is an indirect question?
These three modals of present probability are used when there is an expectation based on experience or evidence. Negative forms can be included.
What are should, shouldn't, ought to?
Correct the error in the following sentence.
The student wondered what is the difference between weather and climate.
What is …. wondered what the difference is between....?
These two adverbs are used to describe a recent past time event in the present perfect.
What are just, recently?
The following sentence is an example of this type of clause.
The character Harry Potter, whom J.K. Rowling created, was a fictional wizard.
What is a nonidentifying object relative clause?
The following sentence using the word 'or' introduces this.
I am not sure whether the cell phone or the ipad was invented first.
What are options? (two options)
These two modals of past probability are used to express something that is very certain.
What are can't and couldn't?
Correct the errors in the following sentence.
The employee may has be careless because his computer was hacked.
What is may have been?
These verbs are not usually used the the progressive forms of the perfect tense.
What are stative/non-action verbs?
The following sentence is an example of this type of clause.
The detective examined the car in which the criminal was sitting.
What is an identifying object relative clause as the object of a preposition?
Sentence B is an example of this type of clause.
A I don't know what I can say about your grade.
B I don't know what to say about your grade.
What is a reduced noun clause with an infinitive.
The following sentence is an example of this type of modal.
He may have followed the rules for a strong password but the company is not sure.
What is a modal of past probability that is least/not very certain?
Correct the errors in the following sentence.
Cyber criminals must became more intelligent in the future.
What is will become?