science

Imperfective aspect

Imperfective aspect is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Imperfective aspect rather than just read about it. In short: The imperfective (abbreviated NPFV, ipfv, or more ambiguously impv) is a grammatical aspect used for ongoing, habitual, repeated, or similar semantic roles, whether they are in the past, present, or future. Many languages have a general imperfective; others have distinct aspects for specific roles such as progressive, habitual, and iterative.

Key takeaways

Imperfective aspect belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Imperfective aspect to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Imperfective aspect from memory before moving on to harder problems.

Reference excerpt

The imperfective (abbreviated NPFV, ipfv, or more ambiguously impv) is a grammatical aspect used for ongoing, habitual, repeated, or similar semantic roles, whether they are in the past, present, or future. Many languages have a general imperfective; others have distinct aspects for specific roles such as progressive, habitual, and iterative. The imperfective contrasts with the perfective, which is used for actions as a complete whole.

English English has no general imperfective. The English progressive is used to describe ongoing events, but can also be used in past tense, such as "The rain was beating down". Habitual situations do not have their own verb form (in most dialects), but the construction "used to" conveys past habitual action, as in I used to ski. The simple past tense can be used for situations presented as ongoing, such as The rain beat down continuously through the night. The progressive and imperfective contrast in stative verbs. Stative verbs, such as know, do not use the progressive (*I was knowing Ada), while in many languages with an imperfective (for instance, French), they do (je connaissais Ada).

Indo-Aryan languages Verbs in Hindi-Urdu (Hindustani) have their grammatical aspects overtly marked. Periphrastic Hindi-Urdu verb forms (participle verb forms) consist of two elements, the first of these two elements is the aspect marker and the second element (the copula) is the common tense-mood marker. There are two independent imperfective aspects in Hindi-Urdu: Habitual Aspect, and Progressive Aspect. These two aspects are formed from their participle forms being used with the copula verb of Hindi which is होना honā (to be). However, the aspectual participles can also have the verbs रहना rêhnā (to stay/remain), आना ānā (to come) & जाना jānā (to go) as their copula. The table below shows three verbs होना honā (to be), करना karnā (to do), and मरना marnā (to die) in their aspectual infinitive forms using different copulas.

Some translations are approximate, and the nuance cannot be expressed exactly in English. Some aspectual forms also have the same translations in English but are not interchangeable in Hindi-Urdu. Now, these copula verbs (besides होना honā) can themselves be converted into their participle forms and put into one of the three different aspects of Hindi-Urdu, which are habitual, progressive, and perfective aspects, hence generating sub-aspectual infinitive forms. This way a verb form combining two grammatical aspects is constructed. The table below shows the combined aspectual forms:

The perfective subaspect of the habitual main aspect (habitual) also is imperfective (habitual). Also, these sub-aspects are even more nuanced that it is not possible to translate each of them into English in a unique way. Some translations don't even make sense in English.

Slavic languages

Verbs in Slavic languages have a perfective and/or an imperfective form. Generally, any of various prefixes can turn imperfectives into perfectives; suffixes can turn perfectives into imperfectives. The non-past imperfective form is used for the present, while its perfective counterpart is used for the future. There is also a periphrastic imperfective future construction.

Other languages The imperfective aspect may be fused with the past tense, for a form traditionally called the imperfect. In some cases, such as Spanish and Portuguese, this is because the imperfective aspect occurs only in the past tense; others, such as Georgian and Bulgarian, have both general imperfectives and imperfects. Other languages with distinct past imperfectives include Latin and Persian.

Perfective

The opposite aspect is the perfective (in Ancient Greek, generally called the aorist), which views a situation as a simple whole, without interior composition. (This is not the same as the perfect.) Unlike most other tense–aspect category oppositions, it is typical for a language not to choose either perfective or imperfective as being generally marked and the other as being generally unmarked. In narrative, one of the uses of the imperfective is to set the background scene ("It was midnight. The room was dark. The rain was beating down. Water was streaming in through a broken window. A gun lay on the table."), with the perfective describing foregrounded actions within that scene ("Suddenly, a man burst into the room, ran over to the table, and grabbed the gun."). English does not have these aspects. However, the background-action contrast provides a decent approximation in English:

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Imperfective aspect

Start with the simplest possible case. Write down what Imperfective aspect claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Imperfective aspect before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Imperfective aspect ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Imperfective aspect

In research: Imperfective aspect appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Imperfective aspect in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Imperfective aspect is common in secondary-school and first-year university syllabi. It links to neighbouring topics Grammatical aspects, so understanding it makes those chapters shorter.
In everyday life: Look for Imperfective aspect outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Imperfective aspect in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Imperfective aspect means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Imperfective aspect out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Imperfective aspect in simple terms?

Why does Imperfective aspect matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Imperfective aspect?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Imperfective aspect.