UNIT 4 - Infinitive Forms Quiz

Which of the following sentences uses the perfect infinitive correctly?

• She seems to be studied hard for the test.

• They seem to have studied hard for the test.

• He seems to study hard for the test.

• We seem to have study hard for the test.

Answer explanation

The perfect infinitive is formed with "to have" followed by the past participle. "To have studied" correctly indicates that the studying occurred before the moment implied by the main verb ("seem").

Which sentence expresses an ongoing action with a continuous infinitive?

• I ought to have finished the project by now.

• I ought to be finishing the project now.

• I ought to finish the project tomorrow.

• I ought to have finished the project yesterday.

Answer explanation

The continuous infinitive is formed with "to be" followed by the present participle (ing-form). "To be finishing" indicates an action that is happening or should be happening in the present.

What does the passive infinitive emphasize in this sentence? "The experiment is expected to be completed by tomorrow."

• The people completing the experiment.

• The experiment being completed.

• The time it takes to complete the experiment.

• Who is expected to complete the experiment.

Answer explanation

The passive infinitive ("to be completed") emphasizes the action being done to the experiment, not who is doing it. The focus is on the action itself and its receiver.

Which of the following sentences uses the perfect infinitive to reflect on past actions?

• He seems to have been studying for hours.

• He seems to be studying for hours.

• He seems to study for hours.

• He seems to have studied for hours.

Answer explanation

The perfect infinitive ("to have studied") indicates that the action (studying) was completed before the current observation ("seems"). The other options describe actions happening in the present or continuously.

In the sentence "She appears to be working hard," which infinitive form is used?

• Perfect infinitive

• Continuous infinitive

• Passive infinitive

• Simple infinitive

Answer explanation

"To be working" is the continuous infinitive, indicating an ongoing action that is happening at the moment of speaking.

Which sentence uses the perfect infinitive to express a regret about the past?

• He would like to take more risks.

• He would like to have taken more risks.

• He would like to take more risks now.

• He would like to be taking more risks.

Answer explanation

The perfect infinitive ("to have taken") expresses a past wish or regret, suggesting that he wishes he had taken more risks in the past.

What is the meaning of "The situation seems to have worsened" in terms of timing?

• The situation is worsening now.

• The situation worsened in the past.

• The situation is about to worsen.

• The situation has worsened and is still ongoing.

Answer explanation

The perfect infinitive ("to have worsened") indicates that the worsening of the situation happened before the moment of speaking.

Which sentence uses the passive infinitive?

• She appears to be walking quickly.

• The story is believed to be written by a famous author.

• They seem to be playing soccer.

• He seems to have read the book.

Answer explanation

The passive infinitive ("to be written") focuses on the action and its receiver, not on the subject performing the action. The sentence emphasizes the authorship of the story

What is the purpose of the sentence "Risky behavior is likely to be causing accidents"?

• To describe an ongoing situation in the present.

• To reflect on past accidents.

• To describe a future possibility.

• To suggest a completed action.

Answer explanation

The continuous infinitive ("to be causing") is used to show an action that is currently happening or likely to happen around the present time

Which sentence uses the perfect infinitive to suggest that something happened before a specific moment?

• He seems to be having fun.

• He seems to have had fun.

• He seems to be having fun tomorrow.

• He seems to have having fun.

Answer explanation

The perfect infinitive ("to have had") indicates that the fun happened before the moment of speaking, showing the action was completed prior to the observation