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The English modal auxiliary verbs are a subset of the English auxiliary verbs used mostly to express modality, properties such as possibility and obligation. [a] They can most easily be distinguished from other verbs by their defectiveness (they do not have participles or plain forms [b]) and by their lack of the ending ‑(e)s for the third-person singular.
A molecular model is a physical model of an atomistic system that represents molecules and their processes. They play an important role in understanding chemistry and generating and testing hypotheses.
Modal verbs in Italian form a distinct class (verbi modali or verbi servili). [7] They can be easily recognized by the fact that they are the only group of verbs that does not have a fixed auxiliary verb for forming the perfect , but they can inherit it from the verb they accompany – Italian can have two different auxiliary verbs for forming ...
The Dewar–Chatt–Duncanson model is a model in organometallic chemistry that explains the chemical bonding in transition metal alkene complexes. The model is named after Michael J. S. Dewar , [ 1 ] Joseph Chatt and L. A. Duncanson .
The modal base here is the knowledge of the speaker, the modal force is necessity. By contrast, (5) could be paraphrased as 'Given his abilities, the strength of his teeth, etc., it is possible for John to open a beer bottle with his teeth'. Here, the modal base is defined by a subset of John's abilities, the modal force is possibility.
Host–guest chemistry encompasses the idea of molecular recognition and interactions through non-covalent bonding. Non-covalent bonding is critical in maintaining the 3D structure of large molecules, such as proteins and is involved in many biological processes in which large molecules bind specifically but transiently to one another.
All these modal verbs or "modals" take the first form of the verb after them. These modals (most of them) do not have past or future inflection, i.e. they do not have past or future tense (exceptions being have to and need to). Idiomatic usage – English is reputed to have a relatively high degree of idiomatic usage. [20]
A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds.