History
The Indian linguist Yaska (c. 7th century BCE) dealt with grammatical aspect, distinguishing actions that are processes (bhāva), from those where … 展开

The Germanic languages combine the concept of aspect with the concept of tense. Although English largely separates tense and aspect formally, its aspects (neutral, progressive, … 展开

In some languages, aspect and time are very clearly separated, making them much more distinct to their speakers. There are a number of languages that mark aspect much more saliently than time. Prominent in this category are Chinese and American Sign Language 展开

The following aspectual terms are found in the literature. Approximate English equivalents are given.
• Perfective: 'I struck the bell' (an event viewed in its entirety, … 展开

The most fundamental aspectual distinction, represented in many languages, is between perfective aspect and imperfective aspect. This is the basic aspectual distinction in the Slavic languages.
It semantically … 展开

There is a distinction between grammatical aspect, as described here, and lexical aspect. Other terms for the contrast lexical vs. grammatical include: … 展开

Germanic languages
English
The English tense–aspect system has two morphologically distinct tenses, past and non-past, the latter of which is also known as the present-future or, more commonly and less formally, simply … 展开