Finite verbs, tense and aspect
Distinguish a sentence's finite verb from a gerund, participle or infinitive, then preserve its timeline.
What you will tackle
- Distinguish finite verbs from gerunds, participles and infinitives
- Complete clause structures with appropriate finite verbs
- Maintain tense and aspect according to context and chronology
A verb-like form may not anchor a clause
‘The team measuring the samples’ lacks a finite main verb. ‘The team is measuring the samples’ has the finite auxiliary is. A gerund can act as a noun (‘Measuring takes time’), an infinitive can name a purpose (‘to measure’), and a participle can modify a noun. Identify each form's role.
Let chronology determine aspect
Simple past locates a finished past event. Past perfect (‘had measured’) can mark completion before another past reference point. Present perfect links a past event or period to the present. Do not introduce a perfect tense merely because a sentence sounds formal; the surrounding timeline must justify it.
Build your notes, then practise
Work on paper before opening an explanation. Guided tasks provide a starting point; independent tasks remove the scaffolding; application tasks ask you to justify a method or interpretation in context.
Guided practice
Guided 1
Repair ‘The scientist analysing the results carefully’ as a complete sentence in the present progressive. Identify the finite and nonfinite parts.
Show a starting hint
A finite auxiliary can complete a progressive verb phrase.
Compare with the explained answer
- The existing analysing is a participle and does not supply tense by itself.
- Add is: ‘The scientist is analysing the results carefully.’
- Is is finite; analysing is the participle used with it.
Answer / response criteria: ‘The scientist is analysing the results carefully.’ Finite: is; participle: analysing.
Guided 2
Choose and explain the tense: ‘The archive has held workshops since 2020’ versus ‘The archive held one workshop in 2020.’
Compare with the explained answer
- Has held is present perfect, connecting a past starting point to a period continuing to the present.
- Held is simple past for a specified completed event.
- The supplied time expressions support the different meanings.
Answer / response criteria: Both are grammatical with different time meanings.
Independent practice
Independent 1
Choose a suitable form: ‘By the time the exhibition opened in May, the staff ____ all the labels.’ Options: had checked, checking, to check. Explain the timeline.
Compare with the explained answer
- The checking was completed before the specified past opening.
- Had checked expresses that earlier completion.
- Checking and to check do not supply the finite verb needed here.
Answer / response criteria: had checked.
Independent 2
Complete: ‘By 2019, the team ____ the survey; since then, it ____ three follow-ups.’ Use complete, conduct in suitable forms and explain the reference points.
Compare with the explained answer
- The completion precedes the past reference point, so had completed.
- Since then links the follow-ups to the present, so has conducted.
- The finite auxiliaries establish the tense/aspect of each phrase.
Answer / response criteria: had completed; has conducted.
Application practice
Application 1
Revise ‘Collecting samples to reveal a trend’ into two different complete sentences: one treating collecting as the subject and one describing a team's purpose. Explain the roles.
Compare with the explained answer
- As a gerund subject: ‘Collecting samples reveals a trend.’
- As a purpose infinitive: ‘The team collects samples to reveal a trend.’
- Reveals and collects are finite; collecting is a noun-like gerund in the first, and to reveal expresses purpose in the second.
Answer / response criteria: Both revisions are grammatical with different structures and meanings.
Application 2
A museum record needs to distinguish a finished 2022 restoration from exhibitions continuing up to now. Write two sentences using simple past and present perfect accurately.
Compare with the explained answer
- Use a specified past date for the completed restoration.
- Use a period extending to the present for the exhibitions.
- Do not imply the restoration itself is still continuing.
Answer / response criteria: For example: ‘The museum restored the painting in 2022. It has displayed the work regularly since then.’
What can you explain now?
A museum record needs to distinguish a finished 2022 restoration from exhibitions continuing up to now. Write two sentences using simple past and present perfect accurately.
Compare with the explanation
For example: ‘The museum restored the painting in 2022. It has displayed the work regularly since then.’
Explain the reasoning before comparing. This review records your self-assessment rather than an official score or mastery decision.
After trying it yourself, choose your next review. This is your self-assessment.
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Source and review status
Coverage follows the named requirements and examples in the 2026–2027 ACT test guide and subject descriptions. That guide explicitly does not list every possible topic. The broader coded College and Career Readiness Standards are also mapped to conceptual teaching and practice; this does not calibrate a learner to a score band. The separate scientific-background context list and reading-complexity rubric have their own stated limits.
Original teaching and explained self-check practice are available. Specialist review and difficulty calibration remain pending. Essays require self-check or teacher review and are not automatically marked or awarded official scores.
Official source specification / guide